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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.]
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.
These new routes extend the already existing codeshare agreement signed by the two airlines in August 2015 that covers flights between Vienna and Seychelles via Abu Dhabi, as well as interisland flights between the archipelagos largest islands of Mah and Praslin, which is famous for its protected forest of rare coco-de-mer palm trees.
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.
The Minister from the Seychelles cited Hawkbill Turtle shell and the Coco-de-Mer, the endemic double nut of the Seychelles as articles that warranted inclusion on the list.
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.
The kashkul at Sotheby's was an old one and carved from a coco-de-mer, or coconut.