Also found in: Thesaurus.
1. often underparts A lower part or a portion of a lower part or underside, especially of an animal's body: the robin's pale underparts.
2. A subordinate role, as in a play.
1. a lower part
2. (Zoology) a part on the underside of an animal's body
1. the lower part or side.
2. an auxiliary or secondary part or role.
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|Noun||1.||underpart - 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"|
belly - the underpart of the body of certain vertebrates such as snakes or fish
body part - any part of an organism such as an organ or extremity