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signor an Italian title of respect for a man, similar to "Mr." or "Sir".
signora an Italian title of respect for a married woman, similar to "Mrs." or "Madam".
signore an Italian title of courtesy for a man, similar to "Sir" (used without the proper name).
signorina an Italian title of respect for a girl or unmarried woman, similar to "Miss".
signpost a post bearing a sign indicating location, direction, or other information, as at a street corner. [2 definitions]
sign up to join or cause to join a particular group, class, or activity; register.
Sikh a member of a Hindu religious sect formed about 1500 in India, whose adherents have faith in one god and reject idol worship and the caste system.
silage fresh fodder stored and allowed to ferment in a silo.
sild any of various small or young herring packaged as sardines in Norway.
silence absence of sound; stillness. [6 definitions]
silencer one that silences, esp. a device for muffling the sound made by a gun.
silent making no sound. [6 definitions]
silent butler a container having a handle and a hinged lid and used for collecting ashtray contents, crumbs, and the like for disposal.
silent partner one who invests financially in a business or enterprise but does not become actively involved otherwise.
silex silica, as found in flint or quartz.
silhouette an outline or profile, filled in with a solid dark color, esp. of a person's head. [3 definitions]
silica a crystalline compound of silicon and oxygen that is widely found in quartz, agate, sand, and the like, and used in making glass, concrete, and ceramics.
silica gel a highly absorbent form of silica, used mainly as a drying agent.
silicate a chemical salt containing silicon, oxygen, and a metal, that is found in most rock and is used to make glass and bricks.
siliceous of, containing, or like silica. [2 definitions]
silicic relating to, containing, or obtained from silicon or silica.