μῦ

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.