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Siren :: Siren (n.) An instrument for producing musical tones and for ascertaining the number of sound waves or vibrations per second which produce a note of a given pitch. The sounds are produced by a perforated rotating disk or disks. A form with two disks operated by steam or highly compressed air is used sounding an alarm to vessels in fog.

Disk :: Disk (n.) A part of the receptacle enlarged or expanded under, or around, or even on top of, the pistil..

Umbo :: Umbo (n.) A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane; as, the umbo in the integument of the larvae of echinoderms or in the tympanic membrane of the ear..

Gastropoda :: Gastropoda (n. pl.) One of the classes of Mollusca, of great extent. It includes most of the marine spiral shells, 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..

Disk :: Disk (n.) The lower side of the body of some invertebrates, especially when used for locomotion, when it is often called a creeping disk..

Foot :: Foot (n.) The muscular locomotive organ of a mollusk. 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..

Palm :: Palm (n.) A metallic disk, attached to a strap, and worn the palm of the hand, -- used to push the needle through the canvas, in sewing sails, etc..

Planchet :: Planchet (n.) A flat piece of metal; especially, a disk of metal ready to be stamped as a coin..

Subundation :: Subumbrella (n.) The integument of the under surface of the bell, or disk-shaped body, of a jellyfish..

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

Discoblastic :: Discoblastic (a.) Applied to a form of egg cleavage seen in osseous fishes, which occurs only in a small disk that separates from the rest of the egg..

Discodactylous :: Discodactylous (a.) Having sucking disks on the toes, as the tree frogs..

Myzostomata :: Myzostomata (n. pl.) An order of curious parasitic worms found on crinoids. The body is short and disklike, with four pairs of suckers and five pairs of hook-bearing parapodia on the under side..

Starost :: Starnose (n.) A curious American mole (Condylura cristata) having the nose expanded at the end into a stellate disk; -- called also star-nosed mole.

Whiteweed :: Whiteweed (n.) A perennial composite herb (Chrysanthemum Leucanthemum) with conspicuous white rays and a yellow disk, a common weed in grass lands and pastures; -- called also oxeye daisy..

Discoid :: Discoid (n.) Anything having the form of a discus or disk; particularly, a discoid shell..

Meniscus :: Meniscus (n.) An interarticular synovial cartilage or membrane; esp., one of the intervertebral synovial disks in some parts of the vertebral column of birds..

Disk :: Disk (n.) A discus; a quoit.

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

Drummond Light :: Drummond light () A very intense light, produced by turning two streams of gas, one oxygen and the other hydrogen, or coal gas, in a state of ignition, upon a ball of lime; or a stream of oxygen gas through a flame of alcohol upon a ball or disk of lime; -- called also oxycalcium light, or lime light..

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