Quick Definition
ἀφρός, οῦ, ὁ n.m. foam, froth
Strong's Definition
apparently a primary word; froth, i.e. slaver
KJV Usage: foaming
UBS Dictionary of the Greek New Testament
noun, m. | -οῦ | ἀφρίζω
14.27 · Physical Events and States · Events Involving Liquids and Dry Masses
foam (derivative of ἀφρίζω ‘to cause foaming of a liquid,’ 14.28) a frothy, foaming mass or substance Though ἀφρός may refer to any type of foam or frothy substance, in LUK 9:39 the reference is clearly to frothy saliva coming out of the mouth, something which is typical of persons experiencing an epileptic seizure. A number of languages have quite specific terms for this type of foaming or frothing at the mouth, expressed literally in some instances as ‘his saliva was bubbling out of his mouth’ or ‘the water of his mouth came out in bubbles.’
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Mounce Concise Greek Dictionary
ἀφρός aphros 1x
froth, foam, Lk. 9:39*
Abbott-Smith Greek Lexicon
* ἀφρός, -οῦ, ὁ, foam: Lk 9:39 (MM, s.v.).†
Moulton & Milligan — Vocabulary of the Greek NT
αφρὸς more ordinary ‘‘occasion” or ‘opportunity.” Thus the edict of an Eparch of Egypt, P Oxy I. 34 #12 (a.p. 127) runs τοὺ[ς] διὰ ἀπειθίαν κ[αὶ] ds ἀφορμὴν ζητοῦντας apapτημάτωϊ[ν] τειμωρήσομαι (sce under ἀπείθεια). So in Caracalla’s edict (A.D. 215), P Giss 1. got ἵνα μ[ὴ] πίαρ᾽ αὐτοῖς ἢ δειλίας αἰτία ἢ παρὰ To[i]s κακοήθεσιν érnplelias ἀφορμὴ ὑπολειφθῇ. The last clause recalls Rom 7*, and other passages where ἀφορμή and ἁμαρτία are brought together. (Ζητεῖν ἀφορμήν is a Western reading in Lk 11°). See also BGU II. 6158 (ii/A.D.) ἀφορμὴν εὑρών (/. εὑροῦσα) —a daughter ‘‘ finds an opportunity” to write to her father, i). 6321! (ii/A.D.) Kal ᾽γὼ διὰ πᾶσαν ἀφορμὴν ο[ὐϊχ ὀκνῶ σοι γράψαι περὶ THs] σωτηρίας μου καὶ τῶν ἐμῶν, “ἀπε on every opportunity I do not delay to write you regarding the health of myself and of mine,” 20. IIT. 9235} (ΠῚ A.D.) καλῶς οὖν ποιήσεις, ἐὰν εὕρῃς ἀφορμὴϊν] διαγραψάμενος κτὰλ., P Strass I. 229 Ὁ (iii/A.D.) ἔχοντός τινος ἀφορμὴν κἂν βραχεῖαν δικαίαν κατοχῆς, ‘‘if any one has a just occasion of possession for however brief a period,” and from the inscriptions Prene 105! (c. B.C. 9) d]edos εὐτυχεστέρα[ς λάβοι] ἀφορμάς, and 15 ἵνα ἀφορμὴ γένοιτο τῆς εἰς τὸν Σεβαστὸν τειμῆΞ. The more literal sense of the word is seen in the iv/A.p. letter P Amh 11. 143} μὴ θελήσῃς οὖν, κύριε, pive (— μεῖναι) ἐκτὸς ἡμῶν αὔριον διὰ τὴν adopμὴν τοῦ ὕδατος εἵνα δυνηθῶμεν ποτίσαι τίδ᾽ν μέγαν κλῆρον, ‘so please, sir, do not stay away from us to-morrow, because of the flow of water, so that we may be able to irrigate the large holding” (Edd.). It is common in Vettius, esp. with πράξεως or πραγμάτων : thus p. 2385 περὶ τὰς πράξεις καὶ βιωτικὰς ἀφορμάς. An apparently new verb ἀφορμάζεται is found in the late P Lond IV. 13607 (A.D. 710), in the sense of ‘‘make excuses” (Ed.). In MGr the noun means ‘‘ occasion, cause.” ‘ ap ods. The adj. ἀφριόεντι, as an epithet of the sea, occurs in a late hymn to Isis, Kaébe/ 102874, For the medical writers’ use of ἀφρός (Lk 9%) see Hobart’s plentiful evidence, Med. Language of St Luke, p. 17. The word is MGr.
Liddell-Scott-Jones — Greek-English Lexicon
ἀφρός (aphros) — foam. ἀφρός, ὁ, foam, of the sea, ῥόος Ὠκεανοῖο ἀφρῷ μορύρων[Refs 8th c.BC+], etc.; of a river, [Refs]
2. of persons and animals, foam, slaver, froth, περί τ᾽ ἀ. ὀδόντας γίγνεται[NT+5th c.BC+]frothy blood, [Refs 5th c.BC+]; βακχίου παλαιγενοῦς ἀφρῷ, of wine, [Refs 4th c.BC+]
II. ἀφρὸς νίτρου, ={ἀφρόνιτρον}, [Refs 5th c.BC+]; ἀ. alone, [Refs 4th c.BC+]
II.2. ἀ. αἵματος, ={σπέρμα},[Refs 4th c.BC+]
III. a kind of ἀφύη, [Refs 4th c.BC+]. (ṃbhrós, cf. Sanskrit abhrám 'cloud', Latin imber.)