Entry 2 senses · 2 variants Webster, 1913 Loch /(lŏk)/ · IPA /lɑk/ n. n. 01 n. A lake; a bay or arm of the sea. 1. A lake; a bay or arm of the sea.[Scot.] 02 n. A kind of medicine to be taken by licking with the tongue; a lambative; a lincture. 1. A kind of medicine to be taken by licking with the tongue; a lambative; a lincture.(Med.)