noun
: the petrified stem of a fossil fern (genus Psaronius ) that shows in a polished cross section markings resembling those on the feathers of a starling
noun
: the petrified stem of a fossil fern (genus Psaronius ) that shows in a polished cross section markings resembling those on the feathers of a starling
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012