Entry 3 senses · 2 variants Webster, 1913 Zooid · Zo·oid · IPA /ˈzəʊɔɪd/ a. n. 01 a. Pertaining to, or resembling, an animal. 1. Pertaining to, or resembling, an animal.(Biol.) 02 n. An organic body or cell having locomotion, as a spermatic cell or spermatozooid. 1. An organic body or cell having locomotion, as a spermatic cell or spermatozooid.(Biol.) 2. An animal in one of its inferior stages of development, as one of the intermediate forms in alternate generation.(Zool.)