Hypertext Webster Gateway: "underpart"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Underpart \Un"der*part`\, n.
A subordinate part.
It should be lightened with underparts of mirth.
--Dryden.
From WordNet (r) 1.7 (wn)
underpart
n : a part lying on the lower side or underneath an animal's
body; "the warbler has a white throat and underparts"; "a
woodland mouse with white underparts"
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