digito-shortened from digitalis: the basis of the names of a series of chemical substances derived from digitalis or fox-glove: see quots.1863–72Watts Dict.Chem. II. 330 Digitoleic acid, a kind of fatty acid contained in the leaves of Digitalis purpurea.1875H. G. Wood Therap. (1879) 135 Digitonin is asserted to form the bulk of the soluble digitalin of commerce, and to be the same as saponin, the active principle of soap-bark.1883Syd. Soc.Lex., Digito·genin, a crystallisable substance,..obtained by the action of dilute acids on Digitoresin. Digito·lein, a fat obtained from digitalis leaves. It is a combination of glycerin with digitoleic acid. Digito·nin, a white amorphous substance..is said to form a large part of the soluble digitalis of commerce. Digito·xin..is highly poisonous. It forms colourless crystals. Digitores·in, obtained, along with glucose and Digitonein, on boiling Digitonin with dilute acids.