| math |
| dyad both brace couple couplet distich double harness doublet duad duet duo match mates pair set of two span team the two twain two twosome yoke |
| Dyad (n.) Two units treated as one |
| Dyad (n.) An element, atom, or radical having a valence or combining power of two. |
| Dyad (a.) Having a valence or combining power of two |
| d couple pair twosome twain brace span yoke couplet distich duo duet dyad duad | two items of the same kind |