properly, to shrivel or wither, i.e. to spoil (by any process) or (generally) to ruin (especially figuratively, by moral influences, to deprave) Derivation: probably strengthened from φθίω (to pine or waste);
KJV Usage: corrupt (self), defile, destroy.
TBESG:
φθείρω
to destroy
G:V
φθείρω [in LXX chiefly for שָׁחַת hi., pi., also for חָבַל, etc. ;] to destroy, corrupt, spoil (on the varied usage and distinctive meaning of the word, see Mayor on 2Pe, App., 175 ff.): with accusative, Refs 1Co.3:17 15:23, 2Co.7:2; before ἀπό, 2Co.11:3; ἐν, Refs 2Pe.2:12, Ju 10, Rev.19:2; κατά, Eph.4:22 (cf. δια-, κατα-φθείρω).† (AS)
Thayer:
1) to corrupt, to destroy 1a) in the opinion of the Jews, the temple was corrupted or "destroyed" when anyone defiled or in the slightest degree damaged anything in it, or if its guardians neglected their duties 1b) to lead away a Christian church from that state of knowledge and holiness in which it ought to abide 1c) to be destroyed, to perish 1d) in an ethical sense, to corrupt, deprave
φθείρω
phtheirō
fthi'-ro
Probably strengthened from φθίω phthiō (to pine or waste): properly to shrivel or wither, that is, to spoil (by any process) or (genitive) to ruin (especially figuratively by moral influences, to deprave)
G862 ἄφθαρτοςἄφθαρτος
aphthartos
af'-thar-tos
From G1 (as a negative particle) and a derivative of G5351; undecaying (in essence or continuance)
KJV Usage: not (in-, un-) corruptible, immortal.
G1311 διαφθείρωδιαφθείρω
diaphtheirō
dee-af-thi'-ro
From G1223 and G5351; to rotthoroughly, that is, (by implication) to ruin (passively decay utterly, figuratively pervert)
KJV Usage: corrupt, destroy, perish.
G2704 καταφθείρωκαταφθείρω
kataphtheirō
kat-af-thi'-ro
From G2596 and G5351; to spoilentirely, that is, (literally) to destroy; or (figuratively) to deprave
KJV Usage: corrupt, utterly perish.
G5349 φθαρτόςφθαρτός
phthartos
fthar-tos'
From G5351; decayed, that is, (by implication) perishable
KJV Usage: corruptible.
G5352 φθινοπωρινόςφθινοπωρινός
phthinopōrinos
fthin-op-o-ree-nos'
From a derivative of φθίνω phthinō (to wane; akin to the base of G5351) and G3703 (meaning lateautumn) autumnal (as stripped of leaves)
KJV Usage: whose fruit withereth.
G5355 φθόνοςφθόνος
phthonos
fthon'-os
Probably akin to the base of G5351; illwill (as detraction), that is, jealousy (spite)
KJV Usage: envy.
G5356 φθοράφθορά
phthora
fthor-ah'
From G5351; decay, that is, ruin (spontaneous or inflicted, literally or figuratively)