Mother Carey's chicken[ker′ēz]
Mother Carey's chicken definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Origin: ; from uncertain or unknown; perhaps
Mother Carey's chicken definition by American Heritage Dictionary
A petrel, especially a storm petrel.
Origin: Possibly alteration and partial translation of Medieval Latin māter cāra, Virgin Mary : Latin māter, mother + Latin cāra, feminine of cārus, dear; see kā- in Indo-European roots.