Entry 4 senses · 3 variants Webster, 1913 Lab /lăb/ · IPA /læb/ v. i. n. a. 01 v. i. To prate; to gossip; to babble; to blab. 1. To prate; to gossip; to babble; to blab.[Obs.] 02 n. A telltale; a prater; a blabber. 1. A telltale; a prater; a blabber.[Obs.] 2. Laboratory.[Colloq.] 03 a. Of or pertaining to a laboratory; as, a lab bench. 1. Of or pertaining to a laboratory; as, a lab bench.[Colloq.]