One of the mysteries of the English language finally explained.
Especially of a leaf: irregularly serrated, with the lobes or teeth curved toward the base.
Late 18th century; earliest use found in James Lee (1715–1795), nurseryman. From post-classical Latin runcinatus sawtoothed from classical Latin runcina carpenter's plane, but formerly taken to mean a saw + -ātus. Compare classical Latin runcināre to plane.
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