An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

Same as → Orion Arm.

→ local; → → spur.

One of the largest coherent structures in the radio sky, projecting from the → Galactic plane at → Galactic longitudel ~ 20° and extending to a very high → Galactic latitudeb ~ +80°. It was first identified in low frequency → radio surveys in the 1950s. The spur is also prominent in → soft X-rays. Its origins and nature have long been debated. However, what causes this phenomena is not well understood. It may be due to a combination of → OB associations and → supernova explosions.

→ north; → polar; → spur.

Same as → Orion Arm.

→ Orion; → → spur.

1) A pointed device on the heel of a rider's boot used to urge on the horse.
2) A sharp horny part on the leg of some birds.
3) Geology: A lateral lower mountain ridge descending from the mountain or the main ridge crest.
4) Mining: A small vein branching from a main one.
5) → Orion Spur.

M.E. spur, from O.E. spura, spora "metal implement worn on the heel to goad a horse," akin to M.Du. spore, Du. spoor, O.H.G. sporo, Ger. Sporn "spur."

Šaxâk, from šax "hard ground, especially on the summit or at the skirt of a mountain; anything hard; a mountain," + noun/nuance suffix -âk.
Mehmiz "a spur, a goad," loan from Ar.