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projection booth a small room in a theater from which film, slides, or the like are projected onto a screen; projection room.
projectionist a person who operates a film projector.
projector a machine for projecting an image onto a screen by casting a beam of light through photographic film.
prokaryote an organism that lacks a nucleus membrane and that reproduces by fission. (Cf. eukaryote.)
prolactin a pituitary hormone that stimulates milk secretion in mammals.
prolapse the falling down or slipping out of place of a body part or organ, esp. the uterus. [2 definitions]
prolate of a sphereoid, elongated or extended along the polar axis.
prolegomenon a critical, introductory essay in a book.
prolepsis the anticipation of possible arguments, before they are put forward by an opponent, in order to answer them in advance. [2 definitions]
proletarian of, pertaining or belonging to, or characteristic of the proletariat. [2 definitions]
proletariat the working class, esp. those who lack capital and must sell their usu. unskilled labor in order to survive.
pro-life holding the view that abortion to end a pregnancy is morally wrong.
proliferate to multiply or grow quickly by, or as though by, cell division and the reproductive processes of living things. [3 definitions]
proliferation the act or process of proliferating.
prolific producing young or new growth in abundance; fertile. [2 definitions]
proline an nonessential amino acids that is found in proteins and collagen.
prolix wordy and boringly long. [2 definitions]
prologue an introduction to a spoken or written work such as a speech or play; preface. [3 definitions]
prolong to make (something) last longer; protract. [2 definitions]
prolusion a preliminary essay written as an introductory piece for a more detailed work, or any similarly introductory work or performance.
prom (informal) a formal dance for high school or college students; promenade.