nut·gall 
(nŭtgôl′)
(nŭtgôl′)n.
A nutlike gall. Nutgalls on certain oak trees were formerly used as a source of tannic acid for making ink and dye. Also called gallnut.
- Aristides
- Aristippus of Cyrene
- aristocracy
- aristocrat
- aristocratic
- aristocratical
- aristocratically
- Aristophanes
- rest home
- restiform body
- resting
- resting cell
- restitute
- restitution
- restive
- restively
- restiveness
- restless
- restless legs syndrome
- restlessly
- restlessness
- rest mass
- restock
- Reston
- rest on laurels