Strong's Concordance

Original word: ἄφαντος
Transliteration: aphantos
Definition (short): vanished
Definition (full): invisible

NAS Exhaustive Concordance

Word Origin: from alpha (as a neg. prefix) and phainó
Definition: invisible
NASB Translation: vanished (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From a (as a negative particle) and a derivative of phaino; non-manifested, i.e. Invisible -- vanished out of sight.

see GREEK a

see GREEK phaino

KJV: And their eyes were opened, and they knew him; and he vanished out of their sight.
NASB: Then their eyes were opened and they recognized Him; and He vanished from their sight.