*אַרְכַּבְתָּא, (רכב) (a rider,) the uppermost layer of a clay dam around a field. B. Mets. 103ᵇ בוכרא the first, טפתא the additional (middle), א׳ the uppermost. [Targ. Y. Lev. IX, 17 read אַדְכַּרְתָּהּ.]