Dictionary.com
Thesaurus.com

bishop's-cap

American  
[bish-uhps-kap] / ˈbɪʃ əpsˌkæp /

noun

  1. miterwort.

bishop's-cap British  

noun

  1. another name for mitrewort

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of bishop's-cap

An Americanism dating back to 1830–40

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.