Blend of tetra- (“four”) + couplet (“set of two”).
tetraplet (plural tetraplets)
- Synonym of quartet: A group of four things.
- Coordinate terms: singlet, couplet, triplet, quadruplet, quintuplet, pentuplet, sextuplet, septuplet, octuplet, nonuplet, decuplet, centuplet, multiplet
- Any member of such a group.