Eight, Eighteen, Eighth - Vine's Expository Dictionary of New Testament Words

Eight, Eighteen, Eighth

[ 1,,G3638, okto ]
eight" (Lat., octo, octavus; cp. Eng., "octagon," "octave," "octavo," "October," etc.), is used in Luke 2:21; Luke 9:28; John 20:26; Acts 9:33; Acts 25:6; 1 Peter 3:20; in composition with other numerals, okto kai deka, lit., "eight and ten, eighteen," Luke 13:4, Luke 13:11, Luke 13:16; triakonta kai okto, "thirty and eight," John 5:5.

[ 2,,G3590, ogdoos ]
"eighth" (connected with the preceding), is used in Luke 1:59; Acts 7:8; 2 Peter 2:5; Revelation 17:11; Revelation 21:20.

[ 3,,G3637, oktaemeros ]
an adjective, signifying an "eighth-day" person or thing, "eight days old" (okto, and hemera, "a day"), is used in Philippians 3:5. This, and similar numerical adjectives not found in the NT, indicate duration rather than intervals. The Apostle shows by his being an "eighth-day" person as to circumcision, that his parents were neither Ishmaelites (circumcised in their thirteenth year) nor other Gentiles, converted to Judaism (circumcised on becoming Jews).

Vine's Expository Dictionary of New Testament Words