The Vocalibrate dictionary

supine

/ˈsuːpaɪn/adjective

flat on your back, face upward

The patient lay supine on the table while the doctor examined her.

Near in meaning: recumbentrecliningprostrate
In the family: supinelysupinenesssupination

More words worth knowing

internecinedestructive to both sides within a group eruditevery learned; full of great knowledge erstwhileformer; belonging to an earlier time asinineextremely foolish or silly asceticstrict and simple in lifestyle, without comforts or pleasures disingenuousinsincere, often by pretending to be innocent or open