Wiktionary
underparts
n. (plural of underpart English)
Usage examples of "underparts".
Grampus gave Triton a glimpse of fifty enormous teeth, and with a swirl of rounded flippers turned away his thirty-foot black bulk, tagged with white on underparts, above each eye and on each flank.
They tore at the lashing tentacles, at the soft underparts, at the tough skin of the main gas-sac.