barrier

3 ENTRIES FOUND:

bar·ri·er

noun \ˈbar-ē-ər\

Definition of BARRIER

1
: a material object or set of objects that separates, demarcates, or serves as a barricade—see blood-brain barrier, placental barrier
2
: a factor that tends to restrict the free movement, mingling, or interbreeding of individuals or populations <behavioral and geographic barriers to hybridization>

Seen & Heard

What made you want to look up barrier? Please tell us where you read or heard it (including the quote, if possible).