An electrode that performs electron multiplication by means of secondary emission.
From dyn(a)- a combining form meaning "power," → dynamics + -ode a combining form meaning "way, road," used in the formation of compound words (anode; electrode), from Gk. hodos "way."
doš- (#), dož- (#)
prefix meaning "bad, ill, abnormal."
From Gk. dys- "bad, hard, unlucky," cognate with O.Pers. duš-, Av. duž- (see below), Skt. dus- "bad, wrong, difficult, un-, -less," PIE *dus- "bad, ill."
Doš-, dož- "bad, ill, abnormal," from Mid.Pers. duž-, duš-, O.Pers. duš- (dušiyâr- "bad year, famine"), Av. duž-, duš- "bad" (duž-mainnyav- "evil-minded, enemy," Mod.Pers. došman "enemy"); PIE *dus-, as above.
Dysnomia (136199 Eris I)
Dysnomia in Gk. mythology is the daughter of Eris and the goddess of lawlessness.
Fr.: couche de Dyson
→ Dyson sphere.
Fr.: sphère de Dyson
A hypothetical structure built around a → star by an advanced → civilization to utilize most or all of the → energy radiated by their star. The idea of such a sphere was first formalized and popularized by theoretical physicist Freeman Dyson in 1960, though it was originally put forward by a 1945 science fiction novel. Dyson assumed that the power needs of → intelligent civilizations never stops increasing. He also proposed that searching for the existence of such structures might lead to the discovery of advanced civilizations elsewhere in the Galaxy. Sometimes referred to as a → Dyson shell or → megastructure.
Freeman John Dyson (1923-). His article, entitled "Search for Artificial Stellar Sources of Infrared Radiation," appeared in the 1960 issue of Science, 131 (3414), 1667-1668; → sphere.
DZ white dwarf
sefid kutule-ye DZ
Fr.: naine blanche DZ
A → white dwarf whose spectrum shows metal lines only; no H or He.