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sep⋅a⋅ra⋅tor

[sep-uh-rey-ter]
–noun
1. a person or thing that separates.
2. any of various apparatus for separating one thing from another, as cream from milk, steam from water, or wheat from chaff.
3. Electricity. a device that prevents metal contact between plates of opposite charge in a storage battery.
4. Machinery. retainer 1 (def. 3).

Origin:
1600–10; < LL sēparātor, equiv. to L sēparā(re) to separate + -tor -tor

re⋅tain⋅er

1[ri-tey-ner]
–noun
1. a person or thing that retains.
2. a servant or attendant who has served a family for many years.
3. Also called cage, separator. Machinery. a ring separating, and moving with, balls or rollers in a bearing.
4. Orthodontics.
a. a fixed or removable device worn in the mouth to hold the teeth in their new position during the adaptive period after straightening appliances have been removed.
b. Prosthodontics. a part on a bridge or the like by which the bridge is attached to the natural teeth.

Origin:
1530–40; retain + -er 1


re⋅tain⋅er⋅ship, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To separator
sep·a·ra·tor   (sěp'ə-rā'tər)   
n.  One that separates, as a device for separating cream from milk.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

retainer  (2)
"servant," 1540, from retain (v.). Meaning "dental structure used to hold a bridge in place" is recorded from 1887.
Online Etymology Dictionary, © 2001 Douglas Harper
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Legal Dictionary

Main Entry: re·tain·er
Pronunciation: ri-'tA-n&r
Function: noun
Etymology: Anglo-French retener act of engaging or employing, from retener retenir to engage, retain
1 : the act of a client by which the services of a lawyer are engaged
2 : a fee paid to a lawyer for advice or services or for a claim on services when needed
Merriam-Webster's Dictionary of Law, © 1996 Merriam-Webster, Inc.
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Medical Dictionary

Main Entry: re·tain·er
Pronunciation: ri-'tAn-&r
Function: noun
1 : the part of a dental replacement (as a bridge) by which it ismade fast to adjacent natural teeth
2 : a dental appliance used to hold teeth in their correct position following orthodontic treatment

Main Entry: sep·a·ra·tor
Pronunciation: 'sep-(&-)"rAt-&r
Function: noun
: one that separates: as a : a devicefor separating liquids of different specific gravities (as cream from milk) or liquids from solids b : a dental appliance for separating adjoining teeth to give access to theirsurfaces
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

retainer re·tain·er (rĭ-tā'nər)
n.

  1. One that retains, as a device, frame, or groove that restrains or guides, especially for a prosthesis.

  2. An appliance used to hold teeth in position after orthodontic treatment.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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