CIACATLAN armpit / su sobaco ( T for possessed form ) [(1)Tp.133]. This appears to be a truncation of CIACATITLAN ‘flank’ with a specialized meaning. T has CĒYEC corresponding CIAC. See CIAC(A)-TL. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 33.