Quick Definition
κεραία, ας, ἡ n.f. an apostrophe
Strong's Definition
feminine of a presumed derivative of the base of 2768; something horn-like, i.e. (specially) the apex of a Hebrew letter (figuratively, the least particle)
KJV Usage: tittle
UBS Dictionary of the Greek New Testament
noun, f. | -ας | κέρας
33.37 · Communication · Written Language
stroke, short mark, short line of a letter, part of a letter a part of a letter of the alphabet The reference of ἰῶτα (33.36) and κεραία is to the small details of the Law, and therefore it may be appropriate in many languages to translate MAT 5:18 as ‘not one of the smallest parts of the Law will be done away with’ or ‘... will become null and void.’
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
κεραία [WII κερέα (see their App. p. 151)], -as, 7, (κέρας), @ little horn; extremity, apex, point; used by the Grk. grammarians of the accents and diacritical points. In Mt. v. 18 [(where see Wetstein; cf. also Edersheim, Jesus the Messiah, i. 537 sq.)]; Lk. xvi. 17 of the little lines, or projections, by which the Hebr. letters in other respects similar differ from each other, as Hand 7, Tand4, Δ and 3,[A.V. title]; the meaning is, ‘not even the minutest part of the law shall perish.’ [(Aeschyl.,Thuce.,al.)|
Mounce Concise Greek Dictionary
κεραία keraia 2x
pr. a horn-like projection, a point, extremity; in NT an apex, or fine point; as of letters, used for the minutest part, a tittle, Mt. 5:18; Lk. 16:17*
Abbott-Smith Greek Lexicon
* κεραία (WH, κερέα, v. App., 151), -ας, ἡ
(< κέρας),
a little horn: of the point or extremity which distinguishes some Heb. letters from others (e.g. ד from ר; DCG, ii, 733), Mt 5:18, Lk 16:17.†
Liddell-Scott-Jones — Greek-English Lexicon
κεραία (keraia) — tittle. κεραία, poetry κεν-αίη, ἡ, (κέρας) horn, [Refs 2nd c.BC+]
2. antennae of the crayfish or of insects, [Refs 4th c.BC+]
II. anything projecting like a horn: hence,
II.1. yard-arm, [Refs 5th c.BC+], etc.; κ. καθελέσθαι, ὑφιέναι, i.e.lower sail, [Refs 2nd c.BC+]
II.1. b projecting beam of a crane, etc., [Refs 5th c.BC+]
II.1. c projecting parts of the hucklebone, [Refs 4th c.BC+]
II.1. d branching stake of wood, used as a pale in a palisade, [Refs 2nd c.BC+]
II.1. e horns of the ancilia, [Refs 1st c.AD+]
II.2. plural, horns of the moon, [Refs 4th c.BC+]
II.3. in writing, apex of a letter, [NT+4th c.BC+]; διὰ πάσης κ. διῆκον showing itself in every word of a speech, [Refs 1st c.BC+]
II.4. leg of a pair of compasses, [Refs 2nd c.AD+]
II.5. projecting spur of a mountain, [Refs 1st c.AD+]; of the horns of Europe and Africa at the Straits of Gibraltar, [Refs 6th c.AD+]; arms of a harbour, [Refs 2nd c.AD+]
II.6. ={κέρας} see [Refs], wing of an army, [Refs 3rd c.AD+]
II.7. plural, supposed teat-like projections inside the womb, [Refs]; but the Fallopian tubes, [Refs 2nd c.AD+]
III. bow made of horn, [Refs 6th c.AD+]