krausen

krau·sen

 (kroi′zən, krou′-) or kräu·sen (kroi′zən)

n.

The yeasty foam that rises to the surface of fermenting wort; barm.

tr.v. krau·sened, krau·sen·ing, krau·sens

To add actively fermenting wort to a fermented wort, as before bottling.

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[German Kräusen, from variant of Krausen, plural of Krause, frill, ruff, gather, crimp (in reference to the foam curling back from the edge of the container in which the beer ferments), from kraus, crinkled, frizzy, crumpled, from Middle High German krūs, curly, crimped; akin to Middle Dutch croes, curly, crimped, and English crouse.]

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.