Definition of "lanugo" [‖La•nu•go]

• A covering of fine, soft hair, as on a leaf, an insect, or a newborn child. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Both boys were limp, wrinkly and covered with fine black hair, known as lanugo, which all fetuses develop but shed at around 33 weeks of gestation."
• "Fine, downy hair called lanugo develops on her arms, legs, and back."
• "Five months after conception, human fetuses grow a thin coat of hair, called lanugo, all over their bodies."