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animalcule (Zoöl.), any one of numerous species of rotifers having a ciliated disk at the anterior end. -- Wheel barometer. (Physics) See under Barometer. -- Wheel boat, a boat with wheels, to be used either on water or upon inclined planes or railways. -- Wheel bug (Zoöl.), a large North American hemipterous insect…

n the human intestine. Its body is thickened posteriorly, but is very long and threadlike anteriorly.

One of the two anterior limbs of a bird, pterodactyl, or bat. They correspond to the arms of man, and are usually modified for flight, but in the case of a few species of birds, as the ostrich, auk, etc., the wings are used only as an assistance in running or swimming. As an eagle stirreth up her nest, fluttereth over…

Having the anterior lobes of the foot so modified as to form a pair of winglike swimming organs; -- said of the pteropod mollusks.

Having the anterior limbs or hands adapted for flight, as the bats and pterodactyls.

s from eight to ten long. The body is yellowish or yellowish green, mixed with black, and anteriorly with black lines. -- Yellow spot. (a) (Anat.) A small yellowish spot with a central pit, the fovea centralis, in the center of the retina where vision is most accurate. See Eye. (b) (Zoöl.) A small American butterfly (…

One of the articular processes of a vertebra, of which there are usually four, two anterior and two posterior. See under Vertebra. -- Zyg`ap*o*phys"i*al, a.