Entry 1 sense Webster, 1913 Tomium /(tō"mĭ*ŭm)/ · To·mi·um · IPA /ˈtoʊmiəm/ 01 n. The cutting edge of the bill of a bird. pl. Tomia ((tō"mĭ*ȧ)) 1. The cutting edge of the bill of a bird.(Zool.)