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It’s also the name of a great Phish song!

Two great Phish songs!

Axillary in English also means "of armpit"

Same in spanish.

I think that's also the more "technical" term for armpit in english, so probably not an accident: https://en.wikipedia.org/wiki/Axilla

Yep, comes from Latin! [1]

In Spanish too. The usual term it's "sobaco" which came from sub-brachium, under the arm.

Didn't know that! In Portuguese, we use the word "Suvaco"

Same in English. (At least, in medicine.)