Brazil nut

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A tropical South American evergreen tree (Bertholletia excelsa) having large round woody fruits containing edible oily three-sided seeds.
• noun The seed of this tree.

from The Century Dictionary.

• noun The seed of the fruit of Bertholletia excelsa, a tree of the natural order Myrtaceæ, a native of Guiana, Venezuela, and Brazil.

from the GNU version of the Collaborative International Dictionary of English.

• (Bot.) An oily, three-sided nut, the seed of the Bertholletia excelsa; the cream nut.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Alternative spelling of brazil nut.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun tall South American tree bearing brazil nuts
• noun three-sided tropical American nut with white oily meat and hard brown shell