[luh-noo-goh, -nyoo-]
noun, plural lanugos. Biology.
a coat of delicate, downy hairs, especially that with which the human fetus or a newborn infant is covered.

1670–80; < Latin lānūgō wooliness, down, derivative of lāna wool Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lanugo (ləˈnjuːɡəʊ)
n , pl -gos
a layer of fine hairs, esp the covering of the human fetus before birth
[C17: from Latin: down, from lāna wool]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

lanugo la·nu·go (lə-nōō'gō, -nyōō'-)
n. pl. la·nu·gos
The fine, soft hair that grows on a fetus and is present on a newborn. Also called lanugo hair.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
lanugo   (lə-n'gō)  Pronunciation Key 
A covering of fine, soft hair or hairlike structures, as on a leaf, insect, or human fetus.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Ribbon seals are born with a natal coat of soft, white hair called lanugo, which provides insulation in air.
Ribbon seal pups are born with a wooly white lanugo coat that is molted after four to five weeks.
Pups are born covered in lanugo, a white wooly hair that insulates them until they can build fat reserves.
Lanugo are fine hairs found on newborns, lost shortly after birth.
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