proof plane
noun
1 Electricity a small flat conductor with an insulating handle that is used to measure the electrical charge of a body by picking up the charge when placed in contact with the body and transferring it to a measuring instrument.
2An object with an optically flat surface; a surface for use as a standard of flatness.
Origin
Mid 19th century; earliest use found in Philosophical Transactions of the Royal Society of London.
- restipulate
- restipulation
- restitch
- restitute
- restitutio ad integrum
- restitutio in integrum
- restitution
- restitutionary
- Restitutionism
- Restitutionist
- restitution nucleus
- restitution suit
- restitutive
- restitutor
- restitutory
- restive
- restively
- restiveness
- rest (lay) on one's oars
- restless
- restless cavy
- restless flycatcher
- restless legs
- restless legs syndrome
- restlessly