σφαίρωμα

ατος, τό
A. anything made round or globular:
1. round weight, in steelyards, Arist. Mech. 853b32.
2. pl., buttocks, S.E. P. 2.211, Gal. 14.707; sg. in Paul.Aeg. 3.77.
3. generally, curve, ζῳδιακοῦ κύκλου Man. 5.32.
4. dub. sens. in PCair.Zen. 659.12 (iii B.C.).
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project