Quick Definition
ἀπονίπτω v. I wash dirt off
Strong's Definition
from 575 and 3538; to wash off (reflexively, one's own hands symbolically)
KJV Usage: wash
UBS Dictionary of the Greek New Testament
verb
47.10 · Activities Involving Liquids or Masses · Use of Liquids
to wash off, to wash to wash off a part of the body
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
ἀπο-νίπτω : to wash off; 1 aor. mid. ἀπενιψάμην;; in mid. to wash one’s self off, to wash off for one’s self: τὰς χεῖρας, Mt. xxvii. 24, cf. Deut. xxi.6 sq. (The earlier Greeks say arovi¢e — but with fut. ἀπονίψω. 1 aor. ἀπέva; the later, as Theophr. char. 25 [30 (17)]; Plut. Phoe. 18; Athen. iv. ¢. 31 p. 149 ¢., ἀπονίπτω, although this is found [but in the mid.] even in Hom. Od. 18, 179.)
Mounce Concise Greek Dictionary
ἀπονίπτω aponiptō 1x
to cleanse a part of the body by washing; mid., of one’s self, Mt. 27:24*
Abbott-Smith Greek Lexicon
ἀπο-νίπτω,
[in LXX for שׁטף, רחץ, מחה;]
to wash off: mid. (reflex.), τ. χεῖρας, Mt 27:24.†
Moulton & Milligan — Vocabulary of the Greek NT
ἀπονίπτω. Sy/Z 8028 (iii/B.c.) : a fraudulent patient at the Asclepieum is told to take off the bandage and ἀπονίψασϑαι τὸ πρόσωπον ἀπὸ τᾶς Kpdvas, in which he sees the penalty of his deceit branded on his face.
Liddell-Scott-Jones — Greek-English Lexicon
ἀπονίπτω (aponiptō) — to wash off. ἀπονίζω, later ἀπονευρ-νίπτω[Refs 8th c.BC+], see below:— wash off, ἀπονίψαντες.. βρότον ἐξ ὠτειλῶν[Refs 8th c.BC+]:—middle, wash off from oneself, ἱδρῶ πολλὸν ἀπονίζοντο θαλάσσῃ [Refs]
II. wash clean, especially of the hands and feet, τὴν ἀπονίζουσα φρασάμην I perceived it (the scar) as I was washing his feet, [Refs 8th c.BC+] —middle, χρῶτ᾽ ἀπονίπτεσθαι wash one's body, variant in [Refs 8th c.BC+]; wash one's hands (especially after meals,[Refs 5th c.BC+]water to wash with, [Refs 4th c.BC+]; so in perfect passive, ἀπονενίμμεθ᾽[Refs 5th c.BC+]; also in late Prose, see above; τῆς κρήνης -νιψάμενος[Refs 4th c.AD+]
II.2. rarely of things, ἀ. τὴν κύλικα[Refs 5th c.BC+]