Etymology
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corm (n.)

also corme, 1570s, "fruit of the service-tree," from French corme, from Latin cornum "cornel-cherry" (but applied to service-berries in French); see cornel. Of the tree itself, 1670s.

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Definitions of corm

corm (n.)
solid swollen underground bulb-shaped stem or stem base and serving as a reproductive structure;
From wordnet.princeton.edu