S0432300 (sī′nə-soid′, -nyə-)n.1. Mathematics See sine curve.2. Anatomy Any of the venous cavities through which blood passes in various glands and organs, such as the adrenal gland and the liver.[Medieval Latin sinus, sine; see sine + -oid.]si′nu·soi′dal(-soid′l) adj.si′nu·soi′dal·ly adv.Thesaurus