(computing) A programming language in which behaviour reuse (or inheritance) is performed via cloning existing objects that serve as prototypes.

(programming) making inheritance possible by cloning objects instead of instantiating them from classes

(organic chemistry) Any of several alkaloids related to berberine

(international law) The Kyoto Protocol to the United Nations Framework Convention on Climate Change: an amendment to the international treaty on climate change, assigning mandatory targets for the reduction of greenhouse gas emissions to signatory nations.

A system that uses traffic-light colours to indicate how widely information or sensitive documents can be shared.

plural of protobranch

Any bivalve mollusc of the subclass Protobranchia

plural of protoatmosphere

Relating to protobiology

(biology) The study of very small biological structures, such as ultraviruses and bacteriophages