Entry 1 sense Webster, 1913 Crotalaria /(kr?t`?-l?"r?-? [or] kr?`t?-l?"r?-A)/ · Crot·a·la·ri·a · IPA /ˌkɹɑtəˈlɛɹi.ə/ 01 n. A genus of leguminous plants; rattlebox. 1. A genus of leguminous plants; rattlebox.(Bot.)