The stem or stalk of a grape cluster; the woody central stem from which individual grapes hang on the vine.
From 'grape' plus 'stalk,' a transparent compound. 'Stalk' comes from Old English and originally meant the stem of a plant, or to pursue stealthily (two meanings that share the sense of something extending forward).
Grape stalks are technically called 'rachises,' but English speakers intuitively created 'grapestalk' anyway—this shows how natural language innovates when technical terms feel too fancy. Many foods have these folk-created compound names that compete with scientific vocabulary.
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