(Internet) A communications protocol that has no error recovery features, and is mostly used to stream material over the Internet.

The first meal after a complete fast; the meal that ends or breaks a fast.

(informal) Any of several extinct animals proposed as an evolutionary link between fossil reptiles and fossil birds; a proavian.

plural of protobird

An aggregation of organic molecules, surrounded by a membrane, that abiotically coalesces into resemblances of living matter; thought to be the precursors of prokaryotic cells

The number of protons in an atom.

(electronics) A board, having a matrix of small holes to which components may be attached without solder, used for the temporary construction and testing of electrical and electronic circuits

plural of protoboard

plural of protobiont

plural of protocadherin