axilla

In most individuals the white color in the axilla extends onto the posterior edge of the upper arm.

From A Review of the Middle American Tree Frogs of the Genus Ptychohyla by William E. Duellman

Flanks dark brown with pale blue spots in axilla and groin and bluish white flecks on mid-flank.

From Neotropical Hylid Frogs, Genus Smilisca by William E. Duellman

In this species the lateral yellow stripe is indistinct and is persistent only in the axilla; the dorsolateral stripes terminate anterior to the hind limbs and are not separated from the tan dorsum.

From The Amphibians and Reptiles of Michoacán, México by William E. Duellman

His right hand had only one small sore upon it, and no tumour discovered itself in the corresponding axilla.

From An Inquiry into the Causes and Effects of the Variolae Vaccinae A Disease Discovered in Some of the Western Counties of England, Particularly Gloucestershire, and Known by the Name of the Cow Pox by Edward Jenner

Ventrolateral glands noticeably thickened, extending from axilla nearly to groin and only narrowly separated medially on chest.

From Descriptions of Two Species of Frogs, Genus Ptychohyla Studies of American Hylid Frogs, V by William E. Duellman

Countered another scientist: What about "man's retention of abundant tufts in the axillae and pubic regions?"

From Time Magazine Archive

There was some hair in the axillae and on the pubes, but only the slightest down on the scalp, and even that was absent on the skin.

From Anomalies and Curiosities of Medicine by Walter L. (Walter Lytle) Pyle

You specify the axillae and the front region of the chest and lower part of scapulae: now, these are all hairy spots in man.

From More Letters of Charles Darwin — Volume 2 by Sir Francis Darwin

Her arms were elevated and kept from her body by the fat in her axillae.

From Anomalies and Curiosities of Medicine by Walter L. (Walter Lytle) Pyle

An extensive area of the throat, breast, axillae, median belly, and inguinal region is covered by hairs pure white to the skin.

From A New Subspecies of Wood Rat (Neotoma mexicana) from Colorado by Robert B. Finley