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single only one. [8 definitions]
single-handed done without help. [2 definitions]
single-minded focused on a single goal or purpose.
singular having to do with or designating the form of a word that indicates only one. [2 definitions]
sinister threatening or suggesting evil, injury, or danger; ominous.
sink to fall or drop slowly to another level. [8 definitions]
sinuous having many curves or turns.
sinus any of the hollow places in the skull that connect with the nose.
Sioux a member of a group of Native American peoples who are from the plains of the northern United States and southern Canada.
sip to drink slowly and a little at a time. [3 definitions]
siphon a tube or pipe used to suck a liquid over the top of its container and into a lower one by means of air pressure. [2 definitions]
sir (often capitalized) a form of address for a man, usually used in place of his name. [2 definitions]
siren a warning device that makes a loud, piercing noise.
Sirius the brightest star in the sky. Sirius is in the constellation Canis Major and is also called the Dog Star.
sissy a coward.
sister a female having the same parents as another person. [3 definitions]
sisterhood the relationship between or among sisters. [2 definitions]
sister-in-law the sister of one's husband or wife. [2 definitions]
sit to be in a position in which one is resting on the buttocks and thighs. [6 definitions]
site the location or proposed location of a town, city, building, or event.
sit tight to stay and wait for further information or events.