thrain (English) comes from English three, from Middle English thre, from Old English þrī, from Proto-West Germanic þrīʀ, from Proto-Germanic þrīz, from Proto-Indo-European *tréyes.
thrain (English): Three, as coordinate term to (and used in similar sentences to) twain
Definitions
Three, as coordinate term to (and used in similar sentences to) twain
Ancestry of “thrain”, step by step
thrain traces back through two separate lines of ancestry.
A standard software protocol and applications programming interface (API) that regulates communication between software applications and imaging devices such as scanners and digital cameras