Lewis Short
pyrēthrum | -on (noun N) = πύρεθρον,: or
* 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.
Charlton T. Lewis, Charles Short, A Latin Dictionary