What is "aegle marmelos"

Bel \Bel\ (b[e^]l), n. [Hind., fr. Skr. bilva.] A thorny rutaceous tree ( [AE]gle marmelos) of India, and its aromatic, orange-like fruit; -- called also Bengal quince, golden apple, wood apple. The fruit is used medicinally, and the rind yields a perfume and a yellow dye.

Aegle marmelos, commonly known as bael (or bili or bhel), also Bengal quince, golden apple, Japanese bitter orange, stone apple, or wood apple, is a species of tree native to Bangladesh and India. It is present throughout Southeast Asia as a naturalized species. The tree is considered to be sacred by Hindus. Its fruits are used in traditional medicine and as a food throughout its range.