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Achaemenids

(Encyclopedia)Achaemenids ăkˌəmĕnˈĭdz [key], dynasty of ancient Persia. They were descended presumably from one Achaemenes, a minor ruler in a mountainous district of SW Iran. His successors, when Elam declin...

norepinephrine

(Encyclopedia)norepinephrine nôrˌĕpīnĕfˈrən [key], a neurotransmitter in the catecholamine family that mediates chemical communication in the sympathetic nervous system, a branch of the autonomic nervous sys...

oilbird

(Encyclopedia)oilbird, common name for an owllike, cave-dwelling bird, Steatornis caripensis, belonging to the family Steatornithidae. It spends its days in dark caves, maneuvering by means of a batlike sonar devic...

mayfly

(Encyclopedia)mayfly, any insect of the order Ephemeroptera, so named because the adults live for a short time, often only a single day, during which they molt twice, mate, and lay their eggs in freshwater. The adu...

Merian, Maria Sibylla

(Encyclopedia)Merian, Maria Sibylla märēˈä zĭbüˈlä māˈrēän [key], 1647–1717, German naturalist, entomologist, and painter of insects and flowers, b. Frankfurt; daughter of Matthäus Merian, the elder....

peacock

(Encyclopedia)peacock or peafowl, large bird of the genus Pavo, in the pheasant family, native to E Asia. There are two main species, the common (Pavo cristatus), and the Javanese (P. musticus) peacocks, both found...

wind tunnel

(Encyclopedia)wind tunnel, apparatus for studying the interaction between a solid body and an airstream. A wind tunnel simulates the conditions of an aircraft in flight by causing a high-speed stream of air to flow...

Zog

(Encyclopedia)Zog zŭk [key], 1895–1961, king of Albania. Originally Ahmet Muhtar Bej Zogolliu (later Albanianized to Zogu), he came from a Muslim family and served in the Austrian army in World War I. He became ...

smart weapon

(Encyclopedia)smart weapon, missile or steerable bomb equipped with a laser, television, or satellite guidance system. Smart weapons, which use guidance systems that rely on external assistance, are distinguished f...

tody

(Encyclopedia)tody tōˈdē [key], common name for small (3–4 in./9–10 cm) West Indian birds of the family Todidae, comprising the single genus Todus. Bright green above with red throats, they are forest birds ...