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

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

prosthetic [pros-thet-ik] , adjective
prosthetically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prosthesis (ˈprɒsθɪsɪs, prɒsˈθiːsɪs)
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]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

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
Only the second case of an elephant prosthesis, the new limb will need several
  tweaks over the coming months.
Surgeons have implanted a novel neural prosthesis into a paralyzed patient's
His new prosthesis has a hydraulic knee that gives him better mobility.
Although fitted for a prosthesis, she could not wear it until the wound from
  her surgery healed.
Related Words
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