an oyster or a clam from the sea (see Molina); -calli may refer to the shell (SW)
IPAspelling:
ɑːmetskɑlli
Alonso de Molina:
ametzcalli. ostia dela mar o almeja. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 4v. col. 2. Thanks to Joe Campbell for providing the transcription.