The Collaborative International Dictionary
Dracontic
Dracontic \Dra*con"tic\,
[From L. draco dragon, in allusion to the terms dragon's head and dragon's tail.] (Astron.) Belonging to that space of time in which the moon performs one revolution, from ascending node to ascending node. See Dragon's head, under Dragon. [Obs.] ``Dracontic month.''
--Crab