What is the meaning of Decan?

One of a collection of 36 small constellations or zodiacal subdivisions that appear heliacally at intervals of 10 days or are separated by approximately 10 degrees.

To remove (something, especially nuclear reactor fuel) from a can or similar protective enclosure, cladding, etc.

accusative singular of deca

to smear, daub

one in charge of ten monks

dean

Source: wiktionary.org