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1. Hard fat obtained from parts of the bodies of cattle or sheep, used in foodstuffs or to make leather dressing, soap, and lubricants, and formerly used to make candles.
2. Any of various similar fats, such as those obtained from plants.
tr.v. tal·lowed, tal·low·ing, tal·lows
1. To smear or cover with tallow.
2. To fatten (animals) in order to obtain tallow.

[Middle English talghe, talowe, either borrowed from Middle Low German talch or descended directly from Old English *tealg-, both ultimately from Proto-Germanic *talga-; probably akin to Gothic tulgus, firm, solid, and Old English tulge, firmly, very.]

tal′low·y adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.