Principal English Translation: 

postposition within, inside (see Karttunen)

Orthographic Variants: 
Frances Karttunen: 

-IHTEC postposition within, inside / dentro de algo (M for -IHTIC) A common variant is -IHTIC. This I may drop or be retained after possessive prefixes, NOHTIC – NIHTIC ‘inside me.’ See IHTE-TL, -C(O)
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 99.