position micrometer
now rare
noun
An apparatus for measuring the position angle of one celestial object relative to another, containing a thread or wire mounted at the common focus of the objective lens and eyepiece of a telescope, which can be rotated in a plane perpendicular to the axis of the telescope; an apparatus similarly used with a microscope.
Origin
Mid 19th century; earliest use found in The Penny Cyclopaedia.
- quant. suff.
- quantulum
- quantum
- quantum bit
- quantum-chemical
- quantum chemist
- quantum chemistry
- quantum chromodynamics
- quantum computer
- quantum computing
- quantum condition
- quantum cryptography
- quantum defect
- quantum dot
- quantum-dynamical
- quantum dynamics
- quantum efficiency
- quantum-electrodynamic
- quantum-electrodynamical
- quantum electrodynamics
- quantum-electronic
- quantum electronics
- quantum field theory
- quantum fluctuation
- quantum gravity