The Collaborative International Dictionary
Diallel
Diallel \Di"al*lel\, a. [Gr. ? crossing.]
Meeting and intersecting, as lines; not parallel; -- opposed
to parallel. [Obs.]
--Ash.
Wiktionary
diallel
a. 1 (context genetics English) Involving crosses between several or all possible combinations. 2 (context obsolete English) meet and intersecting, as lines; not parallel.