An abnormal growth or swelling on a plant, usually caused by insects, mites, fungi, or bacteria; also called a gall.
From Latin 'caecus' meaning 'blind' or 'enclosed', referring to the closed pouch-like nature of most plant galls.
Some cecidiums are so specialized that they're created by only one specific insect species—the plant and insect have evolved a relationship so tight that without the other, neither looks normal.
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