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heartwood

(Encyclopedia)heartwood, the central, woody core of a tree, no longer serving for the conduction of water and dissolved minerals; heartwood is usually denser and darker in color than the outer sapwood. Before the s...

ambergris

(Encyclopedia)ambergris ămˈbərgrēs [key], waxlike substance originating as a morbid concretion in the intestine of the sperm whale. Lighter than water, it is found floating on tropical seas or cast up on the sh...

barracuda

(Encyclopedia)barracuda, slender, elongated fish of tropical seas. Barracudas have long snouts and projecting lower jaws armed with large, sharp-edged teeth. They are ferocious, striking at anything that gleams, an...

screwpine

(Encyclopedia)screwpine, any plant of the genus Pandanus, tropical shrubs or trees characterized by aerial prop roots, ranging throughout the Old World tropics, especially in the Pacific. The usually spiral arrange...

Sangihe Islands

(Encyclopedia)Sangihe Islands sängˈē [key], volcanic group (314 sq mi/813 sq km), Indonesia, NE of Sulawesi. Tahuna is the chief town and port. The islands are mountainous, forested, and fertile; tropical woods,...

bird-of-paradise flower

(Encyclopedia)bird-of-paradise flower, large tropical herb (Strelitzia reginae) of the family Musaceae (banana family), native to S Africa. Its large blue and orange blossom resembles an exotic bird; it is cultivat...

madder

(Encyclopedia)CE5 Bluet, Houstonia caerulea, a member of the madder family madder, common name for the Rubiaceae, a family of chiefly tropical and subtropical trees, shrubs, and herbs, especially abundant in N ...

mojarra

(Encyclopedia)mojarra mōhärˈə [key], common name for a member of the family Gerreidae, small tropical food fishes. The many American species are found chiefly off the S Atlantic coast but also along the Pacific...

Ashmore and Cartier Islands

(Encyclopedia)Ashmore and Cartier Islands ăshˈmōr, cärˌtē-āˈ [key], unhabited tropical islands, 2 sq mi (5 sq km), E Indian Ocean, a dependency of Australia located 190 mi (300 km) NW of N Western Australia...

mother-of-pearl

(Encyclopedia)mother-of-pearl or nacre nāˈkər [key], the iridescent substance that forms the lining of the shells of some fresh-water and some salt-water mollusks. Like the pearl it is a secretion of the mantle,...