FROM STRONG’S GREEK DICTIONARY (1890)

Strong’s Greek Dictionary (1890) — public domain, printed whole.

deuteroprotos δευτερόπρωτος ον — dyoo-ter-op'-ro-tos — from 1208 and 4413; second-first, i.e. (specially) a designation of the Sabbath immediately after the Paschal week (being the second after Passover day, and the first of the seven Sabbaths intervening before Pentecost):--second ... after the first.

see GREEK for 1208

see GREEK for 4413