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1. A fan-leaved palm (Lodoicea maldivica) native to the Seychelles, having an extremely large seed enclosed in a hard shell resembling a pair of coconuts.
2. The seed of this plant. In both senses also called double coconut.

[French : coco, coconut + de, of + mer, sea.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
Behind him, as he walked through the city gates, an antelope skin and brass-handled crutch under his arm, and a begging-bowl of polished brown coco-de-mer in his hand, barefoot, alone, with eyes cast on the ground--behind him they were firing salutes from the bastions in honour of his happy successor.
Coco-de-mer palms (Lodoicea maldivica) are native to two islands in the Seychelles that have starved, rocky soil.
The islands are also home to two UNESCO World Heritage sites: The Vallee de Mai, upon whose ancient palms grows the wondrous Coco-de-mer and fabled Aldabra, the largest raised atoll in the world.
To commemorate his visit, President planted a Coco-de-Mer seed at the Bio-Diversity Centre.
Praslin is the second largest island in the Seychelles and is the site of the Vallee de Mai Unesco World Heritage Site, where the rare coco-de-mer tree grows.
Here is the only place on Earth you can find the gigantic coco-de-mer, the world's largest seed.
Ken's shop was like a vast reference library where a carved Persian coco-de-mer begging bowl rubbed shoulders with a quartet of lavishly gilded Flemish allegorical pilasters (circa 1700 - estimate pounds 6,000-pounds 9,000, which means the auctioneers have no idea what they're worth).
The Seychelles have several rare-bird colonies and the fabled coco-de-mer palms, and may actually have more giant tortoises than the Galipagos.
A single coco-de-mer, the largest known seed, can weigh 23 kilograms, as much as an airline passenger's checked luggage, writes Jonathan Silvertown, an ecologist at the Open University in Milton Keynes, England.