See Also:

eta(1) (iou)



eta noun1. LME.
[Greek eta.]
The seventh letter (¦§, ¦Ç) of the Greek alphabet. LME.
Freq. written ¦Ç.
a. attrib. Astronomy. (Preceding the genitive of the Latin name of the constellation) denoting the seventh brightest star in a constellation. L18.
b. Physics. In full eta meson. A meson with zero isospin and spin and a mass of 549 MeV. M20.
eta prime a meson like the eta meson except for having a mass of 958 MeV.
Comb.: eta patch a large fan-shaped patch by which rigging can be attached to the envelope of an airship.