heterotactous,a.|-ˈtæktəs| [f.Gr. ἑτερο- hetero- + τακτ-ός ordered, arranged + -ous.] Characterized by heterotaxy. a.Anat. and Bot. Having organs abnormally placed or arranged. b.Geol. Without regularity of stratification. a1889G. K. Gilbert in Worcester's Suppl., Heterotactous mountain mass.