pros·the·sis

[pros-thee-sis for 1; pros-thuh-sis for 2]
noun, plural pros·the·ses [-seez for 1; -seez for 2 ] .
1.
a device, either external or implanted, that substitutes for or supplements a missing or defective part of the body.
2.
Grammar, Prosody. the addition of one or more sounds or syllables to a word or line of verse, especially at the beginning.

Origin:
1545–55; < Late Latin < Greek prósthesis a putting to, addition, equivalent to prós to + thésis a placing; see thesis

pros·thet·ic [pros-thet-ik] , adjective
pros·thet·i·cal·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
prosthesis (ˈprɒsθɪsɪs, prɒsˈθiːsɪs) [Click for IPA pronunciation guide]
 
n , pl -ses
1.  surgery
 a.  the replacement of a missing bodily part with an artificial substitute
 b.  an artificial part such as a limb, eye, or tooth
2.  linguistics another word for prothesis
 
[C16: via Late Latin from Greek: an addition, from prostithenai to add, from pros- towards + tithenai to place]
 
prosthetic
 
adj
 
pros'thetically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Prosthesis is always a great word to know.
So is gobo. Does it mean:
a fool or simpleton; ninny.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Etymonline
Word Origin & History

prosthesis
1553, "addition of a letter or syllable to a word," from L.L., from Gk. prosthesis "addition," from prostithenai "add to," from pros "to" + tithenai "to put, place" (see theme). Meaning "artificial body part" is first recorded 1706.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

prosthesis pros·the·sis (prŏs-thē'sĭs)
n. pl. pros·the·ses (-sēz)

  1. An artificial device used to replace a missing body part, such as a limb or a heart valve.

  2. Replacement of a missing body part with such a device.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
prosthesis   (prŏs-thē'sĭs)  Pronunciation Key 
Plural prostheses (prŏs-thē'sēz)
An artificial device used to replace a missing or defective body part, such as a limb or a heart valve.

prosthetic adjective (prŏs-thět'ĭk)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It should also help in the development of better prosthesis and may even help
  to give robots a better tactile sense of their own.
Although fitted for a prosthesis, she could not wear it until the wound from
  her surgery healed.
Only the second case of an elephant prosthesis, the new limb will need several
  tweaks over the coming months.
She has since been fitted with a special prosthesis, which will have to be
  adjusted as she grows.
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