What does "axolotl" mean?

Axolotl: An amphibian of the salamander tribe found in the elevated lakes of Mexico; the siredon. Note: When it breeds in captivity the young develop into true salamanders of the genus Amblystoma. This also occurs naturally under favorable conditions, in its native localities; although it commonly lives and breeds in a larval state, with persistent external gills. See Siredon.