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From dictionary.com  

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nit1    ( P )  Pronunciation Key  (nt)
n. 
The egg or young of a parasitic insect, such as a louse.
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[Middle English, from Old English hnitu.]
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nitty adj. 
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Source: The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved. 
nit2    ( P )  Pronunciation Key  (nt)
n. 
A unit of illuminative brightness equal to one candle per square meter, measured perpendicular to the rays of the source.
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[From Latin nitor, brightness, from nitre, to shine.] 
[Download Now or Buy the Book] 
Source: The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved. 
nit (nt)
n. 
The egg or young of a parasitic insect, such as a louse.
Source: The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. 
Main Entry: nit
Pronunciation: 'nit
Function: noun
: the egg of a louse or other parasitic insect; also : the insect itself when young 
Source: Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc. 
nit
n 1: a luminance unit equal to 1 candle per square meter measured perpendicular to the rays from the source 2: egg or young of an insect parasitic on mammals especially a sucking louse; often attached to a hair or item of clothing