Plural of hammock; portable beds or resting devices made of canvas or rope, suspended between two points.
From hammock (from Taíno hamáka), with regular English plural -s. The Taíno word entered English vocabulary in the 1600s through Caribbean exploration and colonization.
Hammocks are perhaps the most successful furniture design of the Caribbean—they're so perfectly adapted to tropical climates (they catch breezes, keep you away from ground insects, and are infinitely portable) that every major navy adopted them as standard sailor's bunks.
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