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semaphore a device for or method of signaling, as on a railroad, by means of lights and symbolic signs or flags. [3 definitions]
sematic serving as a sign of danger, as the coloration of certain poisonous animals.
semblance outward form; appearance. [3 definitions]
sememe in linguistics, the meaning of a morpheme.
semen the slightly milky, viscous fluid that is secreted by male reproductive organs, and that contains sperm.
semester one half of an academic year.
semi (informal) a tractor-trailer truck; semitrailer.
semi- half. [3 definitions]
semiannual occurring or published once each half year or twice each year.
semiaquatic growing in or near water, as cattails. [2 definitions]
semiautomatic not fully automatic. [2 definitions]
semicircle one half of a circle. [2 definitions]
semicircular canal any of three loop-shaped tubular canals in the inner ear that maintain balance and orientation.
semicolon a punctuation mark (;) used to separate independent clauses within a sentence, indicating a less distinct break than that marked by a period, or used to separate clauses or phrases containing commas.
semiconductor a crystalline material such as silicon or germanium that conducts electricity under certain conditions, but not as effectively as metals do.
semiconscious not entirely conscious; half-conscious.
semidetached partly separate or detached; attached on only one side, as two houses sharing a common wall.
semi-detached (chiefly British) a house that is joined to another by a shared wall.
semifinal designating the next-to-last game or match. [2 definitions]
semifinalist one, esp. an athlete, that is qualified to take part in a semifinal contest.
semifluid having characteristics of both a solid and a liquid; thick but able to flow; viscous. [2 definitions]