twinsome

From twin +‎ -some.

twinsome (comparative more twinsome, superlative most twinsome)

1. Characterised or marked by twinness
   • 2011, Nicholas P. Snoek, Urantia The Earth-The Origin Of It All:

     The Pattern and perfected Universe Havona / In twinsome co-ord with the Spirit Infinite.

twinsome (plural not attested)

1. A group of two, especially two twins
   • 2015, Edward Wellen, The 21st Golden Age of Science Fiction:

     But when the cargo hold was one-fourth empty his plan threatened to hit a snag . If the Spican twinsome had their way the Homingbird's hold seemed doomed to stay three-fourths full, unless Boyd jettisoned his cargo—but that would only alert Tar Baby.

• couple, pair; see also Thesaurus:duo

• snowtime