An Etymological Dictionary of Astronomy and Astrophysics

Threefold; consisting of three parts.
→ triple alpha process; → triple conjunction; → triple point; → triple star.

Etymology (EN): M.E., from M.L. triplare “to triple,” from L. triplus “threefold, triple,” from tri-, → three,

• -plus “-fold.”

Etymology (PE): Setâyi, from setâ, from sé→ three + tâ “fold, plait, ply; piece, part,” Mid.Pers. tâg “piece, part.”