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corundum an exceedingly hard mineral, aluminum oxide, occurring commonly in gray, brown, or blue varieties which are used esp. as abrasives, and more rarely in transparent, crystalline forms such as the ruby and sapphire used in expensive jewelry.
coruscate to give off flashes of light; sparkle; glitter.
corvette a small, swift, lightly armed ship, used esp. as an escort. [2 definitions]
corvine of, like, or pertaining to crows, ravens, or jays.
cory the smaller monetary unit of Guinea. (Cf. syli.)
corymb a flat-topped cluster of flowers in which the flower stalks grow upwards from various points of the main stem and become level with each other.
coryza a head cold.
Cos. abbreviation of "Companies," a plural form of "Company" (used in a proper name).
coscript combined form of script.
cosecant in trigonometry, the secant of the complement or the reciprocal of the sine of a given angle or arc.
cosign to sign together with another or others. [2 definitions]
cosignatory affixing one's signature on a document together with one or more other persons. [2 definitions]
cosine in trigonometry, the ratio between the length of the side next to one of the acute angles in a right triangle and the length of the hypotenuse.
cosmetic any preparation, such as lipstick, made to be applied externally to the body to increase attractiveness. [4 definitions]
cosmetology the study of cosmetics or the profession of applying them.
cosmic of or relating to the universe or cosmos. [3 definitions]
cosmic dust very fine particles of matter found in interplanetary space.
cosmic noise interference from radio waves beyond the earth; galactic noise.
cosmic ray high energy radiation, consisting primarily of high-energy protons and alpha particles, that primarily originates from outside the solar system. Upon collision with earth's atmosphere, secondary particles can be produced that sometimes reach the earth's surface.
cosmic rays streams of high-energy charged atomic nuclei or other particles that enter the earth's atmosphere from outer space.
cosmo- world; universe.