whorl[verb]Synonyms: swirl, eddy, gurge, purl, swoosh, whirl, whirlpool
 [TahlilGaran] English Synonym Dictionary ▲
 whorl /wɜːl $ wɔːrl/ 
 noun [countable][
Date: 1400-1500; 
Origin: Probably from whirl]
1.  a pattern made of a line that curls out in circles that get bigger and bigger
2.  technical a circular pattern of leaves or flowers on a stem 
 [TahlilGaran] Dictionary of Contemporary English ▲