Strong's #3637: oktaemeros (pronounced ok-tah-ay'-mer-os)
from 3638 and 2250; an eight-day old person or act:--the eighth day.
Thayer's Greek Lexicon:
̓́
oktaēmeros
1) eight days old
2) passing the eighth day
Part of Speech: adjective
Relation: from G3638 and G2250
Usage:
This word is used 1 times:
Philippians 3:5: "Circumcised the eighth day, of the stock of Israel, of the tribe of Benjamin, a Hebrew"