μῦ
οὕτω τι βαθὺ καὶ μυστηριῶδες ἡ σιγὴ καὶ νηφάλιον, ἡ δὲ μέθη λάλον → silence is something profound and mysterious and sober, but drunkenness chatters
English (LSJ)
τό, name of the letter μ, IG2.4321.24 (iv B. C.), Epigr. ap. Ath. 10.454f, Hellad. ap. Phot.Bibl.p.530 B., etc. 2 μῦ or μὺ μῦ, to represent a muttering sound made with the lips, μῦ λαλεῖν to mutter, Hippon.80 (dub. l.); to imitate the sound of sobbing, μὺ μῦ, μὺ μῦ Ar.Eq.10.
French (Bailly abrégé)
1(τό) :
indécl.
v. Μ, μ.
2interj.
onomatopée pour exprimer un gémissement, un grognement.
Russian (Dvoretsky)
μῦ: I τό indecl. мю (название буквы μ).
II и μύ interj., выраж. скорбь, рыдание, стон Arph.: μῦ λαλεῖν Sext. бормотать.
III voc. к μῦς.
Frisk Etymological English
1
Grammatical information: n.
Meaning: the twlfth letter of the Greek alphabet (inscr. IVa ).
Origin: LW [a loanword which is (probably) not of Pre-Greek origin] Sem.
Etymology: Transformation after νῦ of a Semitic name, cf. Hebr. mēm. Ion. has μῶ for it (Demoχr., Delos IIIa; Schulze KZ 42, 113 = Kl. Schr. 372), like νῶ after ῥω.̃ Cf. Schwyzer 140.
2
Grammatical information: interj.
Meaning: μυμῦ imitation of a complaint. (Ar. Eq. 10).
Origin: ONOM [onomatopoia, and other elementary formations]
Etymology: Cf. Schwentner Die prim. Interjektionen in den idg. Sprachen (1924) 29 a. 50f. Cf. Lat. mu facere. S. μύζω.