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petiolar sinus /pˌɛtɪˈəʊlə ˈsaɪnəs/ n

中文：叶柄凹

中文 · 叶柄凹Español · seno del pecíoloFrançais · sinus pétiolaire
Meaning：Indentation of the leaf’s main part, where it attaches to the petiole.
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Found in these illustrated scenes（1）

Grape leaf

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