(embryology) A formation that occurs during the initial phases of embryonic development in birds, reptiles and mammals.

A series of wins in gambling.

An instrument for measuring the variation in a pulse of light's intensity over time.

plural of streak camera

An elongated retinal area, found in some animals, that offers superior visual acuity.

(slang, derogatory, vulgar) A tall, thin person.

(mineralogy) The surface, usually made from unglazed porcelain, across which a mineral is dragged to determine its streak.

plural of streak plate

A series of mistakes, sometimes also with successes, that help to educate a person

An extended time frame in which a person feels the need to do lots of compulsive tasks, with each task often being neither fun nor rewarding, just to get rid of obsessive thoughts