emydinChem.|ˈɛmɪdɪn| [f. as prec. + -in.] ‘A substance obtained from the eggs of the tortoise, having probably a similar constitution to vitellin’ (Syd. Soc.Lex.). 1882Watts Dict.Chem. II. 487 Emydin forms white, hard, transparent grains, very soluble in dilute potash.