'babool' originates from Hindi, specifically the word 'babul' (बबूल), where it referred to the native 'babul' tree.

'babool' entered English via colonial contact with South Asia (Hindi/Urdu), ultimately coming from South Asian usage of 'babul' and similar forms and becoming 'babool' in modern English.

Initially it referred specifically to the local 'babul' tree; over time the English usage has retained that primary meaning and has also been used for the tree's wood or gum.