babassu \babassu\ n. 1. a tall feather palm of northern Brazil ({Orbignya barbosiana}) with hard-shelled nuts yielding a valuable oil ({) with hard-shelled nuts yielding a valuable oil (}) and a kind of vegetable ivory. Syn: babassu palm, coco de macao, {Orbignya phalerata}, {Orbignya spesiosa}, {Orbignya martiana}. [WordNet 1.5] babbiting