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hich includes the sea urchins. They have a calcareous, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid. [Written also Echinidea, and Echinoida.]

The passing off from the sun's disk of an inferior planet, in a transit.

st of the living and many fossil forms, having jointed arms around the margin of the oral disk; -- also called Brachiata and Articulata. See Illusts. under Comatula and Crinoidea.

Situated on the receptacle or disk of a flower.

parently inserted upon the top of it; -- said of stamens, petals, sepals, and also of the disk.

The principal dressed surface of a plate, disk, or pulley; the principal flat surface of a part or object.

One of a group of stalked rotifers, having ciliated tentacles around the lobed disk.

It is a median organ arising from the ventral region of body, often in the form of a flat disk, as in snails. See Illust. of Buccinum.

Full hand (Poker), three of a kind and a pair. -- Full moon. (a) The moon with its whole disk illuminated, as when opposite to the sun. (b) The time when the moon is full. -- Full organ (Mus.), the organ when all or most stops are out. -- Full score (Mus.), a score in which all the parts for voices and instruments a…

Having the orb or disk complete or fully illuminated; like the full moon.

That part of blastoderm where the hypoblast appears like a small disk on the inner face of the epibladst.

s, and the land and fresh-water snails. They generally creep by means of a flat, muscular disk, or foot, on the ventral side of the body. The head usually bears one or two pairs of tentacles. See Mollusca. [Written also Gasteropoda.]

rtical, elliptical pupils. Their toes are generally expanded, and furnished with adhesive disks, by which they can run over walls and ceilings. They are numerous in warm countries, and a few species are found in Europe and the United States. See Wall gecko, Fanfoot.

epresented in art by rays of gold, or the like, proceeding from the head or body, or by a disk, or a mere line.

A disk with a small aperture, to direct the sight forward, and cure squinting.

An instrument, first used in the East, made of an alloy of copper and tin, shaped like a disk with upturned rim, and producing, when struck, a harsh and resounding noise. O'er distant deserts sounds the Tartar gong. Longfellow.

One of the very minute, disk-shaped bodies found in blood with the ordinary red corpuscles and white corpuscles; a third kind of blood corpuscle, supposed by some to be an early stage in the development of the red corpuscles; -- called also blood plaque, and blood plate.

The moon at the quarters, when half its disk appears illuminated.

Of or pertaining to an imago. Imaginal disks (Zoöl.), masses of hypodermic cells, carried by the larvæ of some insects after leaving the egg, from which masses the wings and legs of the adult are subsequently formed.

(Zoöl.),a group of marine Bryozoa having a circular arrangement of the tentacles upon the disk.