Lexical Definition

‎ὀκταήμερος‎ oktaḗmeros (ok-tah-ay'-mer-os) eighth day ^G:A
from ‎ὀκτώ‎ and ‎ἡμέρα‎

the eighth day.

• an eight-day old person or act

Abbott-Smith

*† ὀκταήμερος, -ον (< ὀκτώ, ἡμέρα),
of the eighth day, eight days old: c. dat. ref., περιτομῇ ὀ., Phl 3:5 (words of this class denote duration, cf. τεταρταῖος).†

Abbott-Smith References

Liddell-Scott-Jones

ὀκταήμερος-ήμερος, ον,

eight days old, [NT]

_{LSJ Scripture Refs: Phil.3.5}