say it: sahyn
sine is a noun meaning "ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle". It carries one recorded sense.
ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for sine come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.