Strong’s Dictionary of Greek Words:
Transliteration:
deuteroprotos
Phonic:
dyoo-ter-op’-ro-tos
Meaning:
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)
KJV Usage:
second ... after the first