pigmentum nigrum
Medical Dictionary

pigmentum nigrum pig·men·tum ni·grum (pĭg-měn'təm nī'grəm)
n.
Melanin of the choroid coat of the eye.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Pigmentum nigrum is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
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