meridian mark
Astronomy
noun
A mark fixed due north or due south of an astronomical instrument, by means of which the instrument is aligned with the local meridian.
Origin
Mid 19th century; earliest use found in John Herschel (1792–1871), mathematician and astronomer.
- electron spin
- electron spin resonance
- electron telescope
- electron tube
- electronvolt
- electron wave
- electronystagmogram
- electronystagmograph
- electronystagmographic
- electronystagmographically
- electronystagmography
- electro-oculogram
- electrooculograph
- electro-oculographic
- electrooculographically
- electro-oculography
- electro-optic
- electro-optical
- electro-optically
- electro-optics
- electro-osmosis
- electro-osmotic
- electropaint
- electropainting
- electropathic