variants:
or less commonly chaste berry
plural chasteberries also chaste berries
Definition of chasteberry
: chaste tree
… my chasteberry bush (Vitex) doesn't start to produce spring buds until well into May. — Carol Savonen, Statesmen Journal (Salem, Oregon), 18 Dec. 2009 Taking chasteberry can reduce symptoms of PMS, including breast tenderness, irritability, depressed mood and headache. — St. Petersburg (Florida) Times, 23 May 2008 She also recommended herbs such as chaste berries, black cohosh and evening primrose oil, depending on the symptoms.— Nina Rao, Springfield (Missouri) News-Leader, 15 July 2003
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Merriam-Webster unabridged
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Time Traveler for chasteberry
The first known use of chasteberry was in 1993
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