Strong's G1324 · Greek

Δίδυμος

Didumos · did'-oo-mos

prolongation from 1364; double, i.e. twin; Didymus, a Christian

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 3 Δίδυμος , -ου, ὁ (prop. name from δίδυμος, -η, -ον , double , sc. παῖς , twin ) Didymus , surname of the apostle Thomas: Jo 11:16 20:24 21:2 .† 

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain