1. of or relating to a dyad or based on two
The Collaborative International Dictionary of English v.0.48:
Dyadic \Dy*ad"ic\, a. [Gr. ?, fr. ? two.]
Pertaining to the number two; of two parts or elements.
Dyadic arithmetic, the same as binary arithmetic.
WordNet (r) 3.0 (2006):
adj 1: of or relating to a dyad or based on two
The Free On-line Dictionary of Computing (30 December 2018):
binary (describing an operator).