Definitions

1. noun

A tree or shrub, especially one with branches used for shade or as a support for climbing plants.

“The park features several arb species native to the region.”

2. noun

A place or area where people, especially children, are allowed to play freely.

“The playground is a popular arb in the neighborhood.”

3. noun

A department or section of a library, especially one that specializes in a particular subject.

“The university’s main library has an arb dedicated to rare books.”

4. prefix

Arb- is a prefix used in the names of trees, especially those used for shade.

“The arb- prefix is found in the names of several tree species.”