Brazil nuts are large nuts with a woody shell that grow on trees in South America and that you can eat.
brazil nut in British English
noun
1.
a tropical South American tree, Bertholletia excelsa, producing large globular capsules, each containing several closely packed triangular nuts: family Lecythidaceae
2.
the nut of this tree, having an edible oily kernel and a woody shell
Often shortened to: brazil
Brazil nut in American English
1.
a gigantic (30-45 m or 100-150 ft) South American tree (Bertholletia excelsa) of the lecythis family, which bears hard-shelled, triangular, oily, edible seeds that grow in large, round, hard-shelled fruits