SUPINE

I. noun Etymology: Middle English supyn, from Late Latin supinum, from Latin, neuter of supinus, adjective Date: 15th century a Latin verbal noun having an accusative of purpose in -um and an ablative of specification in -u , an English infinitive with to , II. adjective see: up Date: 15th century 1. lying on the back or with the face upward, marked by supination, exhibiting indolent or apathetic inertia or passivity, leaning or sloping backward, see: prone ~ly adverb ~ness noun