‖n. [ NL., from Gr. &unr_; topmost + &unr_; tarsus. ] (Zool.) The instep or front of the tarsus. [ 1913 Webster ]

n. [ NL., from L. caesius bluish gray. ] (Chem.) A rare alkaline metal found in mineral water; -- so called from the two characteristic blue lines in its spectrum. It was the first element discovered by spectrum analysis, and is the most strongly basic and electro-positive substance known. Symbol Cs. Atomic number 55. Atomic weight 132.6.
Syn. -- cesium, Cs [ 1913 Webster ]

n. the chemical element of atomic number 55. It is a univalent element, the most electropositive metal. Symbol Cs; atomic weight 132.905. IT has a melting point of 28.4° C.
Syn. -- caesium, Cs. [ WordNet 1.5 ]

n. [ NL., fr. Gr. dyspro`sitos hard to get at. ] (Chem.) An element of the rare earth-group. Symbol Dy; at. wt., 162.5. [ Webster 1913 Suppl. ]

n.; pl. E. Elysiums L. Elysia [ L., fr. Gr. 'Hly`sion, 'Hly`sion pedi`on, Elysian field. ] (Anc. Myth.) 1. A dwelling place assigned to happy souls after death; the seat of future happiness; Paradise. [ 1913 Webster ]

2. Hence, any delightful place. [ 1913 Webster ]

An Elysium more pure and bright than that of the Greeks. I. Taylor. [ 1913 Webster ]

‖n. [ NL., fr. Gr. 'e`ndon within + my^s a muscle. ] (Anat.) The delicate bands of connective tissue interspersed among muscular fibers. [ 1913 Webster ]

pos>n.; pl. E. Gymnasiums L. Gymnasia [ L., fr. Gr. gymna`sion, fr. gymna`zein to exercise (naked), fr. gymo`s naked. ] 1. A place or building where athletic exercises are performed; a school for gymnastics. [ 1913 Webster ]

2. A school for the higher branches of literature and science; a preparatory school for the university; -- used esp. of German schools of this kind. [ 1913 Webster ]

More like ordinary schools of gymnasia than universities. Hallam. [ 1913 Webster ]

‖n.; pl. Indusia [ L., an under garment, fr. induere to put on: cf. F. indusie the covering of the seed spots of ferns. ] (Bot.) (a) A collection of hairs united so as to form a sort of cup, and inclosing the stigma of a flower. (b) The immediate covering of the fruit dots or sori in many ferns, usually a very thin scale attached by the middle or side to a veinlet. (c) A peculiar covering found in certain fungi. [ 1913 Webster ]

‖n. [ NL., fr. Lavoisier, the celebrated French chemist. ] (Chem.) A supposed new metallic element, which was said to have been discovered in pyrites, and some other minerals, and to be of a silver-white color, and malleable. It is not currently (1998) a recognized element. [ 1913 Webster +PJC ]

n. [ NL. & F. See Magnesia. ] (Chem.) A light silver-white metallic element of atomic number 12, malleable and ductile, quite permanent in dry air but tarnishing in moist air. It burns, forming (the oxide) magnesia, with the production of a blinding light (the so-called magnesium light) which is used in signaling, in pyrotechny, or in photography where a strong actinic illuminant is required. Its compounds occur abundantly, as in dolomite, talc, meerschaum, etc. Symbol Mg. Atomic weight, 24.305. Specific gravity, 1.75. [ 1913 Webster ]

Magnesium sulphate. (Chem.) Same as Epsom salts. [ 1913 Webster ]

n. (Chem.) A slightly alkaline chemical substance, Mg(OH)2, the active principle in the antacid milk of magnesia, also used as a laxative. [ WordNet 1.5 ]

n. (Chem.) Magnesia. [ WordNet 1.5 ]

n. [ NL. ] Manganese. [ 1913 Webster ]

‖n. [ NL., fr. Gr. peri` about + my^s muscle. ] (Anat.) The connective tissue sheath which surrounds a muscle, and sends partitions inwards between the bundles of muscular fibers. [ 1913 Webster ]

n. [ NL. See Potassa, Potash. ] (Chem.) An Alkali element, occurring abundantly but always combined, as in the chloride, sulphate, carbonate, or silicate, in the minerals sylvite, kainite, orthoclase, muscovite, etc. Atomic weight 39.0. Symbol K (Kalium). [ 1913 Webster ]

☞ It is reduced from the carbonate as a soft white metal, lighter than water, which oxidizes with the greatest readiness, and, to be preserved, must be kept under liquid hydrocarbons, as naphtha or kerosene. Its compounds are very important, being used in glass making, soap making, in fertilizers, and in many drugs and chemicals. [ 1913 Webster ]

Potassium permanganate, the salt KMnO4, crystallizing in dark red prisms having a greenish surface color, and dissolving in water with a beautiful purple red color; -- used as an oxidizer and disinfectant. The name chameleon mineral is applied to this salt and also to potassium manganate. --
Potassium bitartrate. See Cream of tartar, under Cream. [ 1913 Webster ]

n.; pl. Symposia [ L., fr. Gr. sympo`sion a drinking party, feast; sy`n with + po`sis a drinking. See Syn-, and cf. Potable. ] 1. A drinking together; a merry feast. T. Warton. [ 1913 Webster ]

2. A collection of short essays by different authors on a common topic; -- so called from the appellation given to the philosophical dialogue by the Greeks. [ 1913 Webster ]

n. [ NL. So called from Wasa, or Vasa, the name of a former royal family of Sweden. ] (Chem.) A rare element supposed by Bahr to have been extracted from wasite, but now identified with thorium. [ 1913 Webster ]