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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.
Coco-de-mer palms (Lodoicea maldivica) are native to two islands in the Seychelles that have starved, rocky soil.
Coco-de-mer palms can reuse 90 percent of that prized phosphorus from fronds about to drop, leaving the most depleted dead leaves yet recorded.
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.
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.
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.
The kashkul at Sotheby's was an old one and carved from a coco-de-mer, or coconut.
A favourite with top fashion photographers, this idyllic location is also home to a unique palm forest, the Vallee de Mai and the heaviest seed in the world, the coco-de-mer.