black marlin

noun

: a billfish (Makaira indica) of the Pacific and Indian Oceans that is dark blue above and silvery white below, may reach a length of about 15 feet (4.6 meters) and a weight of 1,650 pounds (748 kilograms), and is a popular sport fish

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!