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n. 1. (Naut.) A small circular or oval wooden block without sheaves, having a groove around it and a hole through it, used for connecting rigging. [ 1913 Webster ]

2. A small round cloud, with a ruddy center, supposed by sailors to portend a storm. [ 1913 Webster ]

3. A small thick disk of glass inserted in a deck, roof, floor, ship's side, etc., to let in light. [ 1913 Webster ]

4. A circular or oval opening for air or light. [ 1913 Webster ]

5. A lantern, with a thick glass lens on one side for concentrating the light on any object; also, the lens itself. Dickens. [ 1913 Webster ]

6. (Astron.) Aldebaran, a bright star in the eye of Taurus or the Bull. [ 1913 Webster ]

7. (Archery & Gun.) The center of a target. [ 1913 Webster ]

8. A thick knob or protuberance left on glass by the end of the pipe through which it was blown. [ 1913 Webster ]

9. A small and thick old-fashioned watch. [ Colloq. ] [ 1913 Webster ]

10. something that exactly succeeds in achieving its goal; as, to score a bull's eye.
Syn. -- bell ringer, mark. [ WordNet 1.5 ]

n. (Arch.) An external angle when obtuse or rounded. [ 1913 Webster ]

n. 1. by crossing the bulldog with terriers.
Syn. -- bull terrier. [ WordNet 1.5 ]

n. (Zool.) A large whippoorwill-like bird (a species of goatsucker) (Caprimulgus carolinensis, formerly Antrostomus Carolinensis), of the southern United States; -- so called from its note. [ 1913 Webster ]

. (Zool.) A dragon fly. See Darning needle, under Darn, v. t. [ 1913 Webster ]

(Chem.) [ From the name of the inventor. ] See Bone oil, under Bone. [ 1913 Webster ]

(Med.) An aqueous solution of carbolic acid, borax, sodium bicarbonate, and glycerin, used as a spray in diseases of the nose and throat. [ Webster 1913 Suppl. ]

{ } [ From Fresnel the inventor, a French physicist. ] A lantern having a lamp surrounded by a hollow cylindrical Fresnel lens. [ 1913 Webster ]

‖ or /mhw>, n. [ F. le the + envoi a sending. See Envoy. ] 1. One or more detached verses at the end of a literary composition, serving to convey the moral, or to address the poem to a particular person; -- orig. employed in old French poetry. Shak. [ 1913 Webster ]

2. A conclusion; a result. Massinger. [ 1913 Webster ]

A principle governing the inheritance of many characters in animals and plants, discovered by Gregor J. Mendel (Austrian Augustinian abbot, 1822-84) in breeding experiments with peas. He showed that the height, color, and other characters depend on the presence of determinating factors behaving as units. In any given germ cell each of these is either present or absent. The following example (using letters as symbols of the determining factors and hence also of the individuals possessing them) shows the operation of the law: Tallness being due to a factor T, a tall plant, arising by the union in fertilization of two germ cells both bearing this factor, is TT; a dwarf, being without T, is tt. Crossing these, crossbreeds, Tt, result (called generation F1). In the formation of the germ cells of these crossbreeds a process of segregation occurs such that germ cells, whether male or female, are produced of two kinds, T and t, in equal numbers. The T cells bear the factor “tallness, ” the t cells are devoid of it. The offspring, generation F2, which arise from the chance union of these germ cells in pairs, according to the law of probability, are therefore on an average in the following proportions: 1 TT : 2 Tt : 1 tt; and thus plants pure in tallness (TT) and dwarfness (tt), as well as crossbreeds (Tt), are formed by the interbreeding of crossbreeds. Frequently, as in this example, owning to what is called the dominance of a factor, the operation of Mendel's law may be complicated by the fact that when a dominant factor (as T) occurs with its allelomorph (as t), called recessive, in the crossbreed Tt, the individual Tt is itself indistinguishable from the pure form TT. Generation F1, containing only the Tt form, consists entirely of dominants (tall plants) and generation F2 consists of three dominants (2 Tt, 1 TT) to one dwarf (tt), which, displaying the feature suppressed in F1, is called recessive. Such qualitative and numerical regularity has been proved to exist in regard to very diverse qualities or characters which compose living things, both wild and domesticated, such as colors of flowers, of hair or eyes, patterns, structure, chemical composition, and power of resisting certain diseases. The diversity of forms produced in crossbreeding by horticulturists and fanciers generally results from a process of analytical variation or recombination of the factors composing the parental types. Purity of type consequently acquires a specific meaning. An individual is pure in respect of a given character when it results from the union of two sexual cells both bearing that character, or both without it. [ Webster 1913 Suppl. ]

(Med.) A basic sulphate of iron; -- so named from Monsel, a Frenchman. [ 1913 Webster ]

[ See Monsel's salt. ] (Med.) An aqueous solution of Monsel's salt, having valuable styptic properties. [ 1913 Webster ]

(Naut.) A mark conspicuously painted on the port side of all British sea-going merchant vessels, to indicate the limit of submergence allowed by law; -- so called from Samuel Plimsoll, by whose efforts the act of Parliament to prevent overloading was procured. [ 1913 Webster ]

n. A famous horse market in London, established in 1766 by Richard Tattersall, also used as the headquarters of credit betting on English horse races; hence, a large horse market elsewhere. [ Webster 1913 Suppl. ]

(Chem.) The double cyanide of ferrous and ferric iron, a dark blue amorphous substance having a coppery luster, used in dyeing, calico printing, etc. Cf. Prussian blue, under Prussian. [ 1913 Webster ]

{ n., . [ After one Twaddell, its inventor. ] A form of hydrometer for liquids heavier than water, graduated with an arbitrary scale such that the readings when multiplied by .005 and added to unity give the specific gravity. [ Webster 1913 Suppl. ]

(Med.) An acute infectious febrile disease, resembling typhoid fever, with muscular pains, disturbance of the digestive organs, jaundice, etc. [ Webster 1913 Suppl. ]