mărăthrus or -os, i, m., or mără-thrum, i, n., = μάραθρον,
fennel , called in pure Lat. feniculum, Plin. 8, 27, 41, § 99: marathros (v. l. marathrus), Ov. Med. Fac. 91.
marathrus (-os) ī, m , μάραθρον, fennel, O. ...
An Elementary Latin Dictionary