"anything meant to obstruct entrance," early 14c., barere, from Anglo-French barrere, Old French barriere "obstacle, gatekeeper," from barre "bar" (see bar (n.1)). First record of barrier reef is from 1805.
intolerance is a barrier to understanding
barren
barrenness
barret
barrette
barricade
barrier
barring
barrio
barrister
bar-room
barrow
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