GRC
Bailly
ου (ὁ) [ᾰᾰ] choc, craquement, IL. 10, 375.
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LSJ
[ᾰρᾰ], ὁ, gnashing or chattering of teeth, ἄ. δὲ διὰ στόμα γίγνετ’ ὀδόντων Il. 10.375, cf. Hes. Sc. 404, Hld. 5.3; prob. f.l. for ἄραδος in Plu. 2.654b. generally, rattling, ringing, σάκεος Call. Del. 147. (Prob. onomatop.)
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
ὁ, Gerassel, ὀδόντων, Zähneklappern, vor Furcht, Il. 10.375.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)