-ˈpīrəm noun
Usage: capitalized
Etymology: New Latin, from Latin fagus beech + New Latin -o- + -pyrum (from Greek pyros wheat) — more at beech , furze
: a genus of European and Asiatic annual plants (family Polygonaceae) having the achene much exceeding the perianth but otherwise resembling members of the genus Polygonum — see buckwheat