Found 2 items, similar to underpart.
English → English (WordNet) Definition: underpart 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”
English → English (gcide) Definition: Underpart Underpart \Un"der*part`\, n. A subordinate part. [1913 Webster] It should be lightened with underparts of mirth. --Dryden. [1913 Webster]