Merriam-Webster Collegiate Dictionary - calypso

 I. noun  Etymology: Latin, from Greek Kalypso  Date: 14th century  1. capitalized a sea nymph in Homer's Odyssey who keeps Odysseus seven years on the island of Ogygia  2. plural ~s New Latin, genus name, probably from Latin a bulbous bog orchid (Calypso bulbosa) of northern regions bearing a single white to purplish flower  II. noun  (plural -sos or -soes)  Etymology: Trinidad English, alteration of kaiso, perhaps ultimately of African origin; akin to eastern Caribbean English caliso, cariso satirical song  Date: 1900 a style of music originating in the West Indies, marked by lively duple meter, and having lyrics that are often improvised and usually satirize local personalities and events; also a song in this style  • ~nian noun or adjective