Antidromous
Antidromous An*tid"ro*mous ([a^]n*t[i^]d"r[-o]*m[u^]s), a.
[Pref. anti- + Gr. dro`mos a running.] (Bot.)
Changing the direction in the spiral sequence of leaves on a
stem.
[1913 Webster]
The Collaborative International Dictionary of English.
2000.