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n. [ Gr. &unr_; truth + -logy. ] The science which treats of the nature of truth and evidence. Sir W. Hamilton. [ 1913 Webster ]

n. 1. 1 a family of small motile sulphur bacteria.
Syn. -- family Athiorhodaceae. [ WordNet 1.5 ]

a. [ Pref. di- + -thionic. ] (Chem.) Containing two equivalents of sulphur; as, dithionic acid. [ 1913 Webster ]

Dithionic acid (Chem.), an unstable substance, H2S2O6, known only in its solutions, and in certain well-defined salts. [ 1913 Webster ]

a. [ Ethyl + thionic. ] (Chem.) Pertaining to, derived from, or designating, an acid so called. [ 1913 Webster ]

Ethionic acid (Chem.), a liquid derivative of ethylsulphuric and sulphuric (thionic) acids, obtained by the action of sulphur trioxide on absolute alcohol.

{ , n. [ L. Aethiops, Gr. &unr_;; &unr_; to burn + &unr_; face. ] A native or inhabitant of Ethiopia; also, in a general sense, a negro or black man.

n. The language of ancient Ethiopia; the language of the ancient Abyssinian empire (in Ethiopia), now used only in the Abyssinian church. It is of Semitic origin, and is also called Geez. [ 1913 Webster ]

{ } a. Of or relating to Ethiopia or the Ethiopians. [ 1913 Webster ]

pos>n. [ NL. See Ethiop. ] (Old Chem.) A black substance; -- formerly applied to various preparations of a black or very dark color. [ Written also æthiops. ] [ Obs. ] [ 1913 Webster ]

Ethiops martial (Old Chem.), black oxide of iron. --
Ethiops mineral (Old Chem.), black sulphide of mercury, obtained by triturating mercury with sulphur. --
Ethiops per se (Old Chem.), mercury in finely divided state, having the appearance of a dark powder, obtained by shaking it up or by exposure to the air.

a. [ Gr. e'y^ well + &unr_; sulphur + &unr_; color. ] (Chem.) Pertaining to, or denoting, an acid so called. [ 1913 Webster ]

Euthiochroic acid (Chem.), a complex derivative of hydroquinone and sulphonic (thionic) acid. -- so called because it contains sulphur, and forms brilliantly colored (yellow) salts. [ 1913 Webster ]

a. [ Is- + ethionic. ] (Chem.) Pertaining to, derived from, or designating, an acid, HO.C2H4.SO3H, obtained as an oily or crystalline substance, by the action of sulphur trioxide on alcohol or ether. It is derivative of sulphuric acid. [ 1913 Webster ]

a. [ Leuco- + Ethiopic. ] White and black; -- said of a white animal of a black species, or the albino of the negro race. [ 1913 Webster ]

n. [ Leuco- + Aethiops. ] An albino. [ Also written leucœthiops. ] [ 1913 Webster ]

n. [ Lithium + Gr. fi`los friend. ] (Min.) A phosphate of manganese and lithium; a variety of triphylite. [ 1913 Webster ]

prop. n. A genus of Old World plants grown as ornamentals.
Syn. -- genus Matthiola. [ WordNet 1.5 ]

n. (Chem.) A salt of methionic acid. [ 1913 Webster ]

a. [ Methyl + thionic. ] (Chem.) Of, pertaining to, or designating, a sulphonic (thionic) acid derivative of methane, obtained as a stable white crystalline substance, CH2.(SO3H)2, which forms well defined salts. [ 1913 Webster ]

a. [ Gr. o'i^nos wine + thionic. ] (Chem.) Pertaining to an acid now called sulphovinic acid or ethyl sulphuric acid. [ 1913 Webster ]

‖n. [ NL., fr. Gr. &unr_; hinder. ] (Anat.) The middle of the posterior, or dorsal, margin of the great foramen of the skull. [ 1913 Webster ]

a. [ Penta- + thionic. ] (Chem.) Pertaining to, or designating, an acid of sulphur obtained by leading hydrogen sulphide into a solution of sulphur dioxide; -- so called because it contains five atoms of sulphur. [ 1913 Webster ]

n. (Chem.) Same as Persulphocyanogen. [ 1913 Webster ]

‖n.; pl. Struthiones [ L., an ostrich, fr. Gr. &unr_;. ] (Zool.) A genus of birds including the African ostriches. [ 1913 Webster ]

‖n. pl. [ NL. See Struthio, and -oid. ] (Zool.) Same as Struthiones. [ 1913 Webster ]

‖n. pl. [ NL. See Struthio. ] (Zool.) (a) A division, or order, of birds, including only the African ostriches. (b) In a wider sense, an extensive group of birds including the ostriches, cassowaries, emus, moas, and allied birds incapable of flight. In this sense it is equivalent to Ratitae, or Dromaeognathae. [ 1913 Webster ]

a. (Zool.) Struthious. [ 1913 Webster ]

a. [ L. struthius, strutheus. ] (Zool.) Of or pertaining to the Struthiones, or Ostrich tribe. [ 1913 Webster ]

n. (Chem.) A salt of tetrathionic acid. [ 1913 Webster ]

a. [ Tetra- + thionic. ] (Chem.) Of, pertaining to, or designating, a thionic derivative, H2S4O6, of sulphuric acid, obtained as a colorless, odorless liquid. [ 1913 Webster ]

[ Gr. &unr_; brimstone, sulphur. ] (Chem.) A combining form (also used adjectively) denoting the presence of sulphur. See Sulpho-. [ 1913 Webster ]

n. (Chem.) A sulphocarbonate. [ 1913 Webster ]

a. [ Thio- + carbonic. ] (Chem.) Same as Sulphocarbonic. [ 1913 Webster ]

n. (Chem.) Same as Sulphocyanate. [ 1913 Webster ]

a. [ Thio- + cyanic. ] (Chem.) Same as Sulphocyanic. [ 1913 Webster ]

n. [ Thiophene + naphthalene. ] (Chem.) A double benzene and thiophene nucleus, C8H6S, analogous to naphthalene, and like it the base of a large series of derivatives. [ Written also thionaphtene. ] [ 1913 Webster ]

a. [ Gr. &unr_; brimstone, sulphur. ] (Chem.) Of or pertaining to sulphur; containing or resembling sulphur; specifically, designating certain of the thio compounds; as, the thionic acids. Cf. Dithionic, Trithionic, Tetrathionic, etc. [ 1913 Webster ]

n. [ Gr. &unr_; brimstone, sulphur. ] (Chem.) An artificial red or violet dyestuff consisting of a complex sulphur derivative of certain aromatic diamines, and obtained as a dark crystalline powder; -- called also phenylene violet. [ 1913 Webster ]

n. [ Thionine + -ol. ] (Chem.) A red or violet dyestuff having a greenish metallic luster. It is produced artificially, by the chemical dehydration of thionine, as a brown amorphous powder. [ 1913 Webster ]

n. (Chem.) A beautiful fluorescent crystalline substance, intermediate in composition between thionol and thionine. [ 1913 Webster ]

n. [ Thionic + -yl. ] (Chem.) The hypothetical radical SO, regarded as an essential constituent of certain sulphurous compounds; as, thionyl chloride. [ 1913 Webster ]

n. [ Thio- + phenyl + -ene. ] (Chem.) A sulphur hydrocarbon, C4H4S, analogous to furfuran and benzene, and acting as the base of a large number of substances which closely resemble the corresponding aromatic derivatives. [ 1913 Webster ]

a. (Chem.) Of, pertaining to, or derived from, thiophene; specifically, designating a certain acid analogous to benzoic acid. [ 1913 Webster ]

n. [ Thio- + phenol. ] (Chem.) A colorless mobile liquid, C6H5.SH, of an offensive odor, and analogous to phenol; -- called also phenyl sulphydrate. [ 1913 Webster ]

n. [ Abbreviated from thionaphthene. ] (Chem.) A double thiophene nucleus, C6H4S2, analogous to thionaphthene, and the base of a large series of compounds. [ Written also thiophtene. ] [ 1913 Webster ]

n. (Chem.) A salt of thiosulphuric acid; -- formerly called hyposulphite. [ 1913 Webster ]

☞ The sodium salt called in photography by the name sodium hyposulphite, being used as a solvent for the excess of unchanged silver chloride, bromide, and iodide on the sensitive plate. [ 1913 Webster ]

a. [ Thio- + sulphuric. ] (Chem.) Of, pertaining to, or designating, an unstable acid, H2S2O3, analogous to sulphuric acid, and formerly called hyposulphurous acid. [ 1913 Webster ]

n. [ Thio- + toluene. ] (Chem.) A colorless oily liquid, C4H3S.CH3, analogous to, and resembling, toluene; -- called also methyl thiophene. [ 1913 Webster ]

n. [ Thiophene + xylene. ] (Chem.) Any one of three possible metameric substances, which are dimethyl derivatives of thiophene, like the xylenes from benzene. [ 1913 Webster ]

n. (Chem.) A salt of trithionic acid. [ 1913 Webster ]