Word Study
supination
CIDE DICTIONARY
supination, n. [L. supinare, supinatum, to bend or lay backward, fr. supinus supine: cf. F. supination. See Supine.].
The act of turning the hand palm upward; also, position of the hand with the palm upward. [1913 Webster]
ROGET THESAURUS
supination
Horizontality
N horizontality, flatness, level, plane, stratum, dead level, dead flat, level plane, recumbency, lying down, reclination, decumbence, decumbency, discumbency, proneness, accubation, supination, resupination, prostration, azimuth, plain, floor, platform, bowling green, cricket ground, croquet ground, croquet lawn, billiard table, terrace, estrade, esplanade, parterre, table land, plateau, ledge, butte, mesa (plain), level, spirit level, horizontal, level, even, plane, flat, flat as a billiard table, flat as a bowling green, alluvial, calm, calm as a mill pond, smooth, smooth as glass, recumbent, decumbent, procumbent, accumbent, lying, prone, supine, couchant, jacent, prostrate, recubant, horizontally, on one's back, on all fours, on its beam ends.For further exploring for "supination" in Webster Dictionary Online