mentono

The bottom of the face, and nothing else. Mentono is the chin: the point of the jaw below the buŝo. The jaw itself is the makzelo, the cheek is the vango, and a barbo grows on all three.

Two near-misses worth keeping straight. Neither is a real seam and both catch people:

• Mencii at rank 1,365, to mention. Latin mentio, a calling to mind, from mens, the mind. Different word, different root, and the resemblance to menton- is pure coincidence: a chin has never had anything to do with a mind.
• Mento is peppermint, the herb, from Latin menta. So mentono is not mento plus an augmentative, and there is no suffix -on- in Esperanto that would make one. What Esperanto does have is -on- for fractions - duono a half, triono a third - which would make mentono a fraction of a mint, and that is nobody's chin.

Mentono is one root of seven letters and the resemblances stop at the spelling.

In use. Mentona barbo is a goatee, a beard on the chin only. Somebody who holds their head high tenas la mentonon supre, and the English gesture of resting the chin on the hand comes out as apogi la mentonon sur la mano. There is no verb.