Guinea gĭn´ē [key], an archaic term for the west coast of Africa. In its widest sense it has been applied to the region from Angola to Senegal. Parts of the region bore names originating in early colonial trade, notably Grain Coast , Ivory Coast (see Côte d"Ivoire ), Gold Coast (see Ghana , country), and Slave Coast . Characteristic of the coast are dense tropical forests, heavy rainfall, and a hot, humid climate. Today the term refers to the Republic of Guinea , Guinea-Bissau , and Equatorial Guinea .