From karar; a dromedary (from its rapid motion as if dancing) -- swift beast.
see HEBREW karar
H3753. kirkarah
[כִּרְכָּרָה] noun feminine dromedary (according to Ki Thes; perhaps from constantly repeated undulating movement); — only plural absolute וּבַכִּרְכָּרוֺת Isaiah 66:20 (+ וּבַמְּרָדִים וּבַצַּבִּים וּבָרֶכֶב בַּסּוּסִים; the whole list is a gloss according to Du CheIntr Is.).