Definition of "pyrola"
noun:
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A genus of dicotyledonous plants of the order Ericaceoe, the heath family, type of the tribe Pyroleoe, characterized by racemed flowers with five converging petals, ten stamens with peculiar four-celled inverted anthers opening by pores, and a capsule opening from the base upward, with cobwebby margins.
from The Century Dictionary and Cyclopedia
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