greg

flock, herd

Spelled greg · grex, genitive gregis, 'flock, herd'

Latin grex is a flock: gregarious people seek company, congregate means gather, and egregious once meant standing out from the flock.

Words built from it

gregarious — sociable and fond of company
greg (flock) + -arious (belonging to)
congregate — to come together in a group
con- (together) + greg (flock) + -ate (make)
egregious — outstandingly bad or shocking
e- (out of; form of ex-) + greg (flock) + -ious (characterized by)
aggregate — to gather things into a whole
ag- (toward; form of ad-) + greg (flock) + -ate (make)
segregate — to separate or keep apart from a group
se- (apart) + greg (flock) + -ate (make)
desegregate — to end enforced separation between groups
de- (undo) + se- (apart) + greg (flock) + -ate (make)

Gregorian — Contains greg, but comes from the name Gregorius, from Greek gregorein (be watchful), not Latin grex, gregis (flock).