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cemmatzotzopaztli [Nahuatl]

In Mexico, a unit of length among the Aztec, about 0.3 meter. Also called cemmatzutzupatzli. It belongs to the cubit family of units.

sources

From the elbow to the wrist of the same arm; cemmatzotzopatzli, ‘a little arm measure,’ from ce, a, one, ma from maitl, arm or hand, tzotzoca, small, inferior, patzoa, to make small, to diminish.

Daniel G. Brinton.
The Lineal Measures of the Semi-Civilized Nations of Mexico and Central America.
Proceedings of the American Philosophical Society, vol. 18, no. 118 pages 194-197 (March 1885).
Page 202.

for further reading

Castillo.