Proto-IE: *ak-m- <PIH *a->, *kām- (IndoIr -k'-)
Meaning: stone, rock
Hittite: aku- c. 'stone', akuwant- 'stony' (Tischler 10-11 to *ak'- 'sharp')
Old Indian: áśman-, gen. áśnaḥ, instr. áśnā m. `stone, rock; firmament, cloud'
Avestan: asman-, gen. ašnō, abl. ašnäat_ 'Stein, Himmel', asmana- 'steinern'; asǝngō-gav-mi 'Händen aus Stein'; aɵangaina- 'steinern'
Other Iranian: OPers asman- 'Himmel'
Old Greek: ep., ion., poet. ákmōn, -onos m. `Amboss'
Baltic: *ak-mō̃ (*ak-men-es) (1)
Celtic: Gaul acaunum `saxum'
Russ. meaning: камень, скала
References: WP I 28 f
Comments: Cf. *k(')em-er/n- #2974 'sky, cloud', often united with "stone" by folk etymology (Hitt. forms show that "heaven" was *k(')em- while "stone" was *ak'm-).
