heterotic adjective 2noun 1forms 3 adjective2 •Of or pertaining to heterosis.An instructive example of a heterotic individual is ʽThe Toast of Botswana’. The Toast is a cross between a female goat and a male sheep. — 2018 •Describing a hybrid form of string theory (See Heterotic string theory on Wikipedia) noun1 •A hybrid organism of this kind. formsheterotics · more heterotic · most heterotic