a sword (an iron macquahuitl) (see Molina); the root word here is the club that had embedded obsidian blades that came to be called the macana in Spanish (from macquahuitl in Nahuatl), but the added reference to metal (tepoztli) makes the weapon into a sword
James Lockhart, Nahuatl as Written: Lessons in Older Written Nahuatl, with Copious Examples and Texts (Stanford: Stanford University Press and UCLA Latin American Studies, 2001), 194.