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A discus; a quoit. Some whirl the disk, and some the javelin dart. Pope.

A friction clutch in which the gripping surfaces are disks or more or less resemble disks.

Unkindness; disservice. [R.] A. Tucker.

Having no disk; appearing as a point and not expanded into a disk, as the image of a faint star in a telescope.

sun in which the moon at the middle of the eclipse conceals the central part of the sun's disk, leaving a complete ring of light around the border.

An optical toy for producing amusing figures or pictures by means of two revolving disks, on one of which distorted figures are painted.

of the relay. It produces much clearer and louder tones than does the ordinary vibrating disk reproducer.

sun. Just before and after a total eclipse, the slender, unobscured crescent of the sun's disk appears momentarily like a row of bright spots resembling a string of beads. The phenomenon (first fully described by Francis Baily, 1774 -- 1844) is thought to be an effect of irradiation, and of inequalities of the moon's e…

A decoration of a flat surface, as of a band or belt, representing circular disks lapping one upon another.

A small thick disk of glass inserted in a deck, roof, floor, ship's side, etc., to let in light.

A disk of bone, wood, or other material, which is made into a button by covering it with cloth. [Written also buttonmould.] Fossil buttonmolds, joints of encrinites. See Encrinite.

An instrument with a graduated disk by means of which the angles of gems are measured in the process of cutting and polishing.

A description of apparent spots on the disk of the sun, or on planets.

Bearing or covered with dry scales, as the under surface of certain ferns, or the disk of some composite flowers.

y which it is moved, and dipping below the water to be raised. The chain has at intervals disks or lifts which fit the tube through which the ascending part passes and carry the water to the point of discharge.

ending upon the persistence of vision and mixture of colors) by means of rapidly rotating disks variously colored.

An apparatus consisting of a slowly revolving disk, usually regulated by clockwork, by means of wich the action of external agents, as light and gravity, on growing plants may be regulated or eliminated.

Any plant of the genus Rudbeckia; -- so called from the cone- shaped disk of the flower head. Also, any plant of the related genera Ratibida and Brauneria, the latter usually known as purple coneflower.

amily Compositæ. The common English and classical daisy is B. prennis, which has a yellow disk and white or pinkish rays.

Concave on the upper side; -- said of a leaf whose disk is lower than the border.