Medical Definition of peltatin
: either of two lactones that occur as glycosides in the rootstock of the mayapple (Podophyllum peltatum) and have some antineoplastic activity:
b or β-peltatin \ ˈbāt-ə-, chiefly British ˈbēt-ə- \ : one C22H22O8 containing only one hydroxyl group with the other replaced by a methoxyl group
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