Etymology
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spearmint (n.)

1530s, from spear (n.2) + mint (n.1). "Said to be a corruption of spire-mint, with reference to the pyramidal inflorescence" [Century Dictionary].

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Definitions of spearmint

spearmint (n.)
common garden herb having clusters of small purplish flowers and yielding an oil used as a flavoring;
Synonyms: Mentha spicata
From wordnet.princeton.edu