: a rounded thick modified underground stem base bearing membranous or scaly leaves and buds and acting as a vegetative reproductive structure — compare bulb, tuber
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borrowed from New Latin cormus, borrowed from Greek kormós "tree trunk after removal of the boughs," from kor-, o-grade derivative from the base of keÃrein "to cut off, shave" + -mos, resultative noun suffix — more at shear entry 1