Liddell–Scott–Jones: δῠ-άς

δῠ-άς,άδος,ἡ,

A. the number two,

Pl. Phd. 101c , Prm. 149c , Arist. Ph. 220a27 , etc.

2. dyad,

ἡ ἀόριστος δ.

Arist. Metaph. 1081a14

, Alex.Aphr. in Metaph. 58.12 .

3. pair,

Philostr. Im. 1.6 , Lib. Or. 61.7 .