Word origin
[iso- +
tretinoin a name for retinoic or Vitamin A acid, equiv. to
t- (of uncert. derivation) +
retino(
ic acid) (
retin(
ol) +
-o- +
-ic) +
-in2]-in is a noun suffix used in a special manner in chemical and mineralogical nomenclature(glycerin; acetin, etc.). In spelling, usage wavers between -in and -ine. In chemistry a certain distinction of use is attempted, basic substances havingthe termination -ine rather than -in (aconitine; aniline, etc.), and -in being restricted to certain neutral compounds, glycerides, glucosides, and proteids(albumin; palmitin, etc.), but this distinction is not always observed