pro·to·gal·ax·y 
(prōtō-găl′ək-sē)
(prōtō-găl′ək-sē)n. pl. pro·to·gal·ax·ies
A cloud of gas, primarily hydrogen, that is forming a galaxy or has sufficient mass to eventually form a galaxy.
- chronic traumatic encephalopathy
- chronic wasting disease
- chrono-
- chronobiologic
- chronobiological
- chronobiologically
- chronobiologist
- chronobiology
- chronogram
- chronogrammatic
- chronogrammatically
- chronograph
- chronographic
- chronographically
- chronologer
- chronologic
- chronological
- chronological age
- chronologically
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- chronology
- chronometer
- chronometric
- chronometrical
- chronometrically