refiner

UK: /rɪˈfaɪnə/

Collins Concise English Dictionary © HarperCollins Publishers::

refiner / rɪˈfaɪnə/ noun

1. a person, device, or substance that removes impurities, sediment, or other unwanted matter from something

WordReference Random House Learner's Dictionary of American English © 2025

re•fine /rɪˈfaɪn/   v. [~ + object] , -fined, -fin•ing. 

1. to separate (something) from impure substances:
   to refine oil.
2. to bring (something) to a finer state or form by purifying, polishing, changing, or making it more precise:
   to refine a theory.

See -fin-.

WordReference Random House Unabridged Dictionary of American English © 2025

re•fine  (ri fīn′), v., -fined, -fin•ing. 
v.t. 

1. to bring to a fine or a pure state;
   free from impurities:
   to refine metal, sugar, or petroleum.
2. to purify from what is coarse, vulgar, or debasing;
   make elegant or cultured.
3. to bring to a finer state or form by purifying.
4. to make more fine, subtle, or precise:
   to refine one's writing style.

v.i. 

5. to become pure.
6. to become more fine, elegant, or polished.
7. to make fine distinctions in thought or language.
8. refine on or upon, to improve by inserting finer distinctions, superior elements, etc.:
   to refine on one's previous work.

• re- + fine¹ 1575–85

re•fin′a•ble, adj. 
re•fin′er, n.