The Collaborative International Dictionary
Heterodromous
Heterodromous \Het`er*od"ro*mous\, a. [Hetero- + Gr. ? to run.]
(Bot.) Having spirals of changing direction.
--Gray.(Mech.) Moving in opposite directions; -- said of a lever, pulley, etc., in which the resistance and the actuating force are on opposite sides of the fulcrum or axis.
Wiktionary
heterodromous
a. 1 Of levers, in which the power and weight move in opposite directions 2 (context botany English) Spiralling in opposite directions on a stem or branch