acai

1a or acai berry :  a small, dark purple, berrylike fruit with a juicy pulp that is often used in beverages or eaten raw and that is produced by a tall, slender palm (Euterpe oleracea) native to tropical rain forests of Central and South Americab :  the palm (Euterpe oleracea) that produces acai berries

2 :  a beverage made from the juice of the acai berry Rio de Janeiro is the city that worships health and beauty and where the healthy and the beautiful drink acai. — Alex Bellosz