n.
A figure of speech in which two essentially unlike things are compared, often in a phrase introduced by like or as, as in "How like the winter hath my absence been" or "So are you to my thoughts as food to life" (Shakespeare).
[Middle English, from Latin, likeness, comparison, from neuter of similis, like. See similar.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.