(Lat. abdomen; from abdo, I conceal. Sometimes regarded as a contraction of adipomen, from adeps, fat.) The posterior cavity of the body, containing the intestines and others of the viscera.
(Lat. aberro, I wander away). Departing from the regular type.
(Gr. a, without; bios, life ; genesis, origin). Spontaneous generation, or the production of living beings without pre-existent life.
(Lat. ah, from ; norma, a rule). Irregular; deviating from the ordinary standard.
The fourth cavity of the complex stomach of the Ruminants.
(Gr. a, without; bragchia, gills). Destitiite of gills or branchiae.
(Gr. akalephe, a nettle). Applied formerly to the Jelly-fishes or Sea-nettles, and other Radiate animals, in consequence of their power of stinging, derived from the presence of microscopic cells, called "thread-cells," in the integument.
(Gr. akantha, a thorn; kephale, head). A class of parasitic worms, in which the head is armed with spines.
(Gr. akantha, spine; pterux, wing). A group of bony fishes with spinous rays in the front part of the dorsal fin.
(Gr. akari, a mite). A division of the Arachnida, of which the Cheese-mite is the type.
(Gr. a, without; kephale, head). Not possessing a distinct head.
The cup-shaped socket of the hip-joint in Vertebrata.
(Gr. akontion, a javelin). Long filaments, charged with thread-cells, attached to the free edges of the mesenteries of Sea-anemones.
(Gr. akritos, confused). A term sometimes employed as synonymous with Protozoa, or the lowest division of the animal kingdom.
(Gr. aktin ; and soma, body). Employed to designate the entire body of any Actinozoon, whether this be simple (as in the Sea-anemones), or composed of several zooids (as in most Corals).
(Gr. aktin; and zoon, an animal). That division of the Coelen-terata of which the Sea-anemones may be taken as the type.
(Gr. adelos, hidden; arthros, joint; soma, body). An order of the Arachnida.