Trefoil is a noun meaning a three-lobed or three-leaved plant shape, often used to describe a shamrock-like symbol or a three-branch structure. It denotes something consisting of or resembling three leaves or lobes, and is frequently encountered in heraldry, botany, and architectural ornamentation. In pronunciation, the word stresses the second syllable and ends with an /ɫ/ sound when spoken softly in some contexts.
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