as in underside
the side or part facing downward from something
the bird's underparts were white
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Recent Examples of underpart
Calliope hummers have glossy green on the back and crown with white underparts.
—
Joan Morris, The Mercury News, 26 July 2019
The adult brown pelican has gray underparts with brown hues, black-brown belly, yellow head and dark brown neck, silver-gray back and wings, with black feathers at the tips.
—Ernie Cowan, San Diego Union-Tribune, 13 June 2019
Joan Morris, The Mercury News, 26 July 2019
The adult brown pelican has gray underparts with brown hues, black-brown belly, yellow head and dark brown neck, silver-gray back and wings, with black feathers at the tips.
—Ernie Cowan, San Diego Union-Tribune, 13 June 2019
Recent Examples of Synonyms for underpart
Noun
-
The fur on the rest of the body is dark to light brown above, with lighter fur on the underside.—
Encyclopedia Britannica,
Encyclopedia Britannica,
2 Apr. 2026
-
To achieve their audacious goals, the fish use hook-like growths on the undersides of both their pectoral and pelvic fins to push themselves upward.—
Andrew Paul,
Popular Science,
2 Apr. 2026
Noun
-
But dating back even further to Monday’s home opener against the Twins, the bottom of the Royals’ order reached base safely in 12 straight plate appearances.—
Sam McDowell,
Kansas City Star,
2 Apr. 2026
-
The Blackhawks scored three runs in the bottom of the sixth, however, to grab the lead for good.—
Paul Johnson,
Chicago Tribune,
2 Apr. 2026
Cite this Entry
“Underpart.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underpart. Accessed 4 Apr. 2026.
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