cement gland or organ
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Disease — Illness or sickness often characterized by typical patient problems (symptoms) and physical findings (signs). Disruption sequence: The events that occur when a fetus that is developing normally is subjected to a destructive agent such as the… … Medical dictionary
Countercurrent exchange — Counter heat current exchange: Note the gradually declining differential and that the once hot and cold streams exit at the reversed temperature difference; the hotter entering stream becomes the exiting cooler stream and vice versa.… … Wikipedia
reproductive system, animal — Introduction any of the organ systems by which animals reproduce. The role of reproduction is to provide for the continued existence of a species; it is the process by which living organisms duplicate themselves. Animals compete with… … Universalium
crustacean — /kru stay sheuhn/, n. 1. any chiefly aquatic arthropod of the class Crustacea, typically having the body covered with a hard shell or crust, including the lobsters, shrimps, crabs, barnacles, and wood lice. adj. 2. belonging or pertaining to the… … Universalium
integument — /in teg yeuh meuhnt/, n. 1. a natural covering, as a skin, shell, or rind. 2. any covering, coating, enclosure, etc. [1605 15; < L integumentum a covering. See IN 2, TEGUMENT] Syn. 1. cortex, involucre, involucrum. * * * Covering of the body,… … Universalium
cirripede — ▪ crustacean Introduction any of the marine crustaceans of the infraclass Cirripedia (subphylum Crustacea). The best known are the barnacles. Adult cirripedes other than barnacles are internal parasites of marine invertebrates such as crabs … Universalium
anseriform — ▪ bird order Introduction any of the 150 species comprising the bird order Anseriformes, which comprises the ducks (duck), geese (goose), and swans (swan) (family Anatidae) and the screamers (the three species of family Anhimidae). Anatidae… … Universalium
gastropod — /gas treuh pod /, n. 1. any mollusk of the class Gastropoda, comprising the snails, whelks, slugs, etc. adj. 2. Also, gastropodous /ga strop euh deuhs/. belonging or pertaining to the gastropods. [1820 30; < NL Gast(e)ropoda a class of mollusks.… … Universalium
columbiform — ▪ bird Introduction any member of the group of birds (bird) that contains the pigeons (pigeon), doves (dove), dodoes (dodo), and solitaires (solitaire). The order Columbiformes is divided into the Raphidae, a family of extinct birds that… … Universalium
cephalopod — /sef euh leuh pod /, n. 1. any mollusk of the class Cephalopoda, having tentacles attached to the head, including the cuttlefish, squid, and octopus. adj. 2. Also, cephalopodic, cephalopodous /sef euh lop euh deuhs/. belonging or pertaining to… … Universalium
