9-Letter Words Starting: PRO

• any of a group of compounds that are inactive precursors of enzymes and require some change (such as the hydrolysis of a fragment that masks an active enzyme) to become active

• the property of being close together

• the region close around a person or thing

• a Gestalt principle of organization holding that (other things being equal) objects or events that are near to one another (in space or time) are perceived as belonging together as a unit

• of or relating to the Protozoa

• the study of spatial distances between individuals in different cultures and situations

• extending out above or beyond a surface or boundary

• boring verbosity

• the anterior part of an insect's thorax; bears the first pair of legs

• write or speak a prologue

• an optical device for projecting a beam of light

• an optical instrument that projects an enlarged image onto a screen