of, pertaining to, or obtained from milk.

1780–90; lact- + -ic

nonlactic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lactic (ˈlæktɪk)
relating to or derived from milk
[C18: from Latin lact-, lac milk]

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

lactic lac·tic (lāk'tĭk)
Of, relating to, or derived from milk.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
To do this, it uses a whole-cell biocatalyst system to make lactic acid by
  fermenting corn sugar.
Nor, again, does the mere presence of lactic acid necessarily imply the
  presence of lactic ferment.
Your muscles become cramped from lactic acid and from the number of hours
  you're standing upright.
Improved circulation speeds up the rate that lactic acid, which builds up
  during a workout, is forced out of those areas.
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