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Anatomy. the armpit.
Ornithology. the corresponding region under the wing of a bird.
Botany. an axil.
Historical Examples

When attached in protected spots in the tender skin of the axilla or groin, they are often in dense clusters of a dozen or more.
Life History and Ecology of the Five-lined Skink, Eumeces fasciatus Henry S. Fitch

The conformation of the region of the axilla was quite peculiar.
The Beaked Whales of the Family Ziphidae Frederick True

A pad is inserted in the axilla, the elbow raised, and the arm placed by the side on a pillow and steadied with sand-bags.
Manual of Surgery Volume Second: Extremities–Head–Neck. Sixth Edition. Alexander Miles

In the axilla of the pectoral there are four or five pale round spots.
Discoveries in Australia, Volume 1. J Lort Stokes

In most individuals the white color in the axilla extends onto the posterior edge of the upper arm.
A Review of the Middle American Tree Frogs of the Genus Ptychohyla William E. Duellman

One of these balls lodged in the inner part of the right arm, below the axilla, whence the writer excised it.
A Treatise on Gunshot Wounds Thomas Longmore

The temperature in the axilla is normally about half a degree lower than in the mouth.
American Red Cross Text-Book on Home Hygiene and Care of the Sick Jane A. Delano

Ventrolateral glands noticeably thickened, extending from axilla nearly to groin and only narrowly separated medially on chest.
Descriptions of Two Species of Frogs, Genus Ptychohyla William E. Duellman

Axil, or axilla, in botany, the angle between the upper side of a leaf and the stem or branch from which it springs.
The New Gresham Encyclopedia. Vol. 1 Part 3 Various

The whole right arm, but principally the axilla, feels as if it had been dislocated by a blow.
New, Old, and Forgotten Remedies: Papers by Many Writers Various

noun (pl) -lae (-liː)
the technical name for the armpit
the area on the undersurface of a bird’s wing corresponding to the armpit

axilla ax·il·la (āk-sĭl’ə)
n. pl. ax·il·lae (-sĭl’ē)
See armpit.