labium
noun
la·bi·um ˈlā-bē-əm 
plural labia ˈlā-bē-ə
1
: any of the folds at the margin of the vulva compare labia majora, labia minora
2
: the lower lip of a labiate corolla
3
a
: a lower mouthpart of an insect that is formed by the second pair of maxillae united in the middle line
b
: a liplike part of various invertebrates
Example Sentences
Recent Examples on the Web The change in shape is also due to the surge in blood — the labia majora may retract, and their retraction can cause the labia minora to appear larger or even show for the first time. 
Kristi Kellogg, Glamour, 29 Apr. 2019 The outer labia can also vary in terms of being barely there or a few inches long, and the inner labia (which are reminiscent of butterfly wings) might be hidden or hang past the outer lips. Zoe Ruderman, Cosmopolitan, 19 June 2017 And, as many pointed out, there is nothing wrong with or unnatural about having dark labia. refinery29.com, 7 May 2018 Most women's labia aren't perfectly symmetrical — one side is usually bigger than the other. Zoe Ruderman, Cosmopolitan, 19 June 2017 Now, doctors are warning anyone with a vagina to steer clear of a product that some are claiming reduces vaginal odor (or at least steer clear of applying it on their labia or in their vaginas). Lily Herman, Allure, 1 Nov. 2017 The vulva, the video states using diagrams (and cute cats), includes the outer labia, inner labia, clitoris, urethral opening, and vaginal opening. Lily Herman, Allure, 5 Oct. 2017 And some people—most people—want their dicks on men and their labia on/vaginas in women. Dan Savage, Chicago Reader, 20 Sep. 2017 Chances are a bump on your labia (the lips) or vulva (the skin around them) is just a pimple or an ingrown hair. Amber Madison, Seventeen, 30 May 2017 See More
Kristi Kellogg, Glamour, 29 Apr. 2019 The outer labia can also vary in terms of being barely there or a few inches long, and the inner labia (which are reminiscent of butterfly wings) might be hidden or hang past the outer lips. Zoe Ruderman, Cosmopolitan, 19 June 2017 And, as many pointed out, there is nothing wrong with or unnatural about having dark labia. refinery29.com, 7 May 2018 Most women's labia aren't perfectly symmetrical — one side is usually bigger than the other. Zoe Ruderman, Cosmopolitan, 19 June 2017 Now, doctors are warning anyone with a vagina to steer clear of a product that some are claiming reduces vaginal odor (or at least steer clear of applying it on their labia or in their vaginas). Lily Herman, Allure, 1 Nov. 2017 The vulva, the video states using diagrams (and cute cats), includes the outer labia, inner labia, clitoris, urethral opening, and vaginal opening. Lily Herman, Allure, 5 Oct. 2017 And some people—most people—want their dicks on men and their labia on/vaginas in women. Dan Savage, Chicago Reader, 20 Sep. 2017 Chances are a bump on your labia (the lips) or vulva (the skin around them) is just a pimple or an ingrown hair. Amber Madison, Seventeen, 30 May 2017 See More Word History
Etymology
New Latin, from Latin, lip — more at lip
First Known Use
1634, in the meaning defined at sense 1
Medical Definition
labium
noun
la·bi·um ˈlā-bē-əm
plural labia -ə
1
: any of the folds at the margin of the vulva compare labia majora, labia minora
2
: a lower mouthpart of an insect that is formed by the second pair of maxillae united in the midline