The Ten Commandments.

Any set of rules that have the weight of authority

(physics) Radioactive decay by emitting an alpha particle.

(British spelling) Alternative spelling of decagram

To deprive of calcareous matter.

Alternative spelling of Decalogue

(computing, less common) Synonym of bit rot

(humorous) form of cease and desist: stop.

(physics, countable) A nuclear reaction with the emission of a gamma ray.

(Egyptology, astrology) 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.