the.com/armpit

the body's most underrated rainforest, quietly running its own swampy ecosystem

means The hollow underneath where your arm meets your shoulder, warm and prone to sweat — and, figuratively, the worst or least pleasant part of any place.

from A plain English compound, bolted together from "arm" and "pit." "Arm" goes all the way back to Old English "earm," a cousin of words across the Germanic family and ultimately tied to an old root meaning "to fit or join" — fitting, since the arm is what's joined to the body. "Pit" comes from Old English "pytt," a hole or hollow, itself borrowed early from Latin "puteus," a well or shaft. So the word is exactly what it says: the little well in your arm. The figurative "armpit of the world" sense for a grim, unlovely place is a much later, distinctly American slang flourish.

sweat glands
apocrine glands here make scent, not just water
smell source
sweat is odorless; bacteria do the stinking
lymph hub
clustered nodes here screen for invaders
medical name
doctors call it the axilla
unique bacteria
each pit hosts its own microbial fingerprint
for instance

axilla — anatomical term for the hollow under the shoulder, containing lymph nodes and the axillary artery

delhi — called 'the armpit of india' due to its geography between the himalayas and the deccan plateau

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