Definitions

1. noun

A type of dwarf shrub or small shrub, typically with woody stems and a rounded crown.

“The arbuscula in the garden has delicate white flowers in spring.”

2. noun (botany)

A small or dwarf shrub of the family Rosaceae, such as a dwarf birch or a mountain ash.

“Arbuscula is a type of arctic shrub found in mountainous regions.”