ὀκταήμεροςoktaḗmeros

of the eighth day, eight days old: with dative ref., περιτομῇ ὀ., Philippians 3:5 (words of this class denote duration, cf.

Greek (New Testament) · G3637

Meanings

τεταρταῖος).

Same root

ὀκτώoktṓ · G3638"eight"
ἡμέραhēméra · G2250day, i.e. (literally) the time space between dawn and dark, or the whole 24 hours (but several days were usually reckoned by the Jews as inclusive of the parts of both extremes); figuratively, a period (always defined more or less clearly by the context)

Where it appears

Appears 1 times in the Bible.

Philippians 3:5 I was circumcised when I was eight days old. I am a pure-blooded citizen of Israel and a member of the tribe of Benjamin—a real Hebrew if there ever was one! I was a member of the Pharisees, who demand the strictest obedience to the Jewish law.

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