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Sexual desire or oestrus of deer, cattle, and various other mammals; heat; also, the period during which the oestrus exists.

anous, bony or horny pieces which form the covering of many fishes and reptiles, and some mammals, belonging to the dermal part of the skeleton, or dermoskeleton. See Cycloid, Ctenoid, and Ganoid. Fish that, with their fins and shining scales, Glide under the green wave. Milton.

The principal bone of the shoulder girdle in mammals; the shoulder blade.

Any large marine mammal, as a seal, walrus, or cetacean.

Any aquatic carnivorous mammal of the families Phocidæ and Otariidæ.

mice, but they have a longer and more pointed nose. Some of them are the smallest of all mammals.

An order of large aquatic herbivorous mammals, including the manatee, dugong, rytina, and several fossil genera.

A mammal having a single hoof on each foot, as the horses and asses; a solidungulate. [Written also solipede.] The solipeds, or firm-hoofed animals, as horses, asses, and mules, etc., -- they are, also, in mighty number. Sir T. Browne.

The blubber of whales or other marine mammals; also, the fat of the hippopotamus. Speck falls (Naut.), falls or ropes rove through blocks for hoisting the blubber and bone of whales on board a whaling vessel.

zona; -- applied to a membrane between the zona radiata and the umbilical vesicle in the mammal embryo.

An animal that suckles its young; a mammal.

g them) which connects the base of the lower jaw with the skull in most vertebrates below mammals.

A genus of nocturnal lemurine mammals having very large eyes and ears, a long tail, and very long proximal tarsal bones; -- called also malmag, spectral lemur, podji, and tarsier.

An order of extinct Mammalia found in the Tertiary formations.

The protuberance through which milk is drawn from the udder or breast of a mammal; a nipple; a pap; a mammilla; a dug; a tit.

oral artery. Temporal bone, a very complex bone situated in the side of the skull of most mammals and containing the organ of hearing. It consists of an expanded squamosal portion above the ear, corresponding to the squamosal and zygoma of the lower vertebrates, and a thickened basal petrosal and mastoid portion, corre…

et, and olive." Fairholt. -- Tertiary period. (Geol.) (a) The first period of the age of mammals, or of the Cenozoic era. (b) The rock formation of that period; -- called also Tertiary formation. See the Chart of Geology. -- Tertiary syphilis (Med.), the third and last stage of syphilis, in which it invades the bones…

mian and Triassic formations in South Africa. In some respects they resembled carnivorous mammals. Called also Theromorpha.

in the throat, or in the neighboring region, of nearly all vertebrates. In man and other mammals it is the throat, or neck, sweetbread, which lies in the upper part of the thorax and lower part of the throat. It is largest in fetal and early life, and disappears or becomes rudimentary in the adult.

unknown function, in the floor of the mouth or the region of the larynx. In man and most mammals it is a highly vascular organ, partly surrounding the base of the larynx and the upper part of the trachea. -- Thyroid dislocation (Surg.), dislocation of the thigh bone into the thyroid foramen. -- Thyroid foramen, the…