Bailly
ῶνος (ὁ) :
1 ricin, ARSTT. H.A. 5, 19 ; 31 ; MÉN. 4, 161 Meineke ;
2 arbrisseau produisant des baies d’où l’on extrait l’huile de croton (cf. κίκι) HPC. 670, 22 ; TH. H.P. 1, 10, 1, etc.
Bailly 2020 Hugo Chávez Gérard Gréco, André Charbonnet, Mark De Wilde, Bernard Maréchal & contributeurs / Licence Creative Commons Attribution - Pas d'Utilisation Commerciale - Pas de Modification — « CC BY-NC-ND 4.0 »
LSJ
ῶνος, ὁ, tick, Ixodes ricinus, Arist. HA 552a15, Agatharch. 58, Dsc. 1.77, Plu. 2.55e; prov., ὑγιέστερος κροτῶνος Men. 318 (but Str. 6.1.12 has Κρότωνος).
castor-oil tree, Ricinus communis (cf. κίκι), Hp. Mul. 2.201, Thphr. HP 1.10.1, 3.18.7, PRev. Laws 39.3, al. (iii BC), etc. in pl., seeds of the tree, PCair. Zen. 499.10 (iii BC); in full, κ. κίκεως Gal. 19.743.
part of the ear, Poll. 2.85. (Hdn. Gr. 1.36 distinguishes κροτών from Κρότων the place-name.)
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)