GRC
Bailly
(τὸ) indécl. la lettre ι, CALLIAS (ATH. 453 d) ; fig. pour signifier un rien, peu de chose, l’ι étant la plus petite lettre de l’alphabet, NT. Matth. 5, 18.
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LSJ
τό, indecl., (Hebr. yôd) the letter ι, Pl. Cra. 418b, Aen.Tact. 31.18, Call. Gramm. ap. Ath. 10.453d, etc.
line, stroke, on a sundial, Bull. Soc. Alex. 4.83 (iii BC).
prov., of anything very small, smallest letter, jot, Ev. Matt. 5.18.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
τό, indecl. Namen des Buchstaben ι, Callias bei Ath. X.453d.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)
TBESG
ἰῶτα, τό ,
iota (Heb. י, i.e. the smallest letter): Mat.5:18.†
(AS)
Translators Brief lexicon of Extended Strongs for Greek based on Abbot-Smith, A Manual Greek Lexicon of the New Testament (1922) (=AS), with corrections and adapted by Tyndale Scholars