Lewis & Short

pyrē̆thrum or -on, i, n., = πύρεθρον, a plant, Spanish chamomile, pellitory: Anthemis pyrethrum, Linn.; Plin. 28, 9, 42, § 151; Cels. 5, 4; 19; Scrib. Comp. 9; 55; Ov. A. A. 2, 418.