From the same as 'eben; a pair of stones (only dual); a potter's wheel or a midwife's stool (consisting alike of two horizontal disks with a support between) -- wheel, stool.
Exodus 1:16 BIB:וּרְאִיתֶ֖ן עַל־ הָאָבְנָ֑יִם אִם־ בֵּ֥ן NAS: and see [them] upon the birthstool, if KJV: and see [them] upon the stools; if it [be] a son, INT: and see upon the birthstool if son
Jeremiah 18:3 BIB:מְלָאכָ֖ה עַל־ הָאָבְנָֽיִם׃ NAS: he was, making something on the wheel. KJV: he wrought a work on the wheels. INT: something on the wheel