calamitean,a.|kæləˈmaɪtiːən| [f. calamite 1 + -an.] Belonging or relating to calamites. 1895Naturalist Aug. 237 The histology of calamitean leaves.1904Amer.Nat. Apr. 250 Thus such transitions are well known, though of a relatively simplified form in the structure of the calamitean stem.