noun Biochemistry.
a compound containing two or more amino acids in which the carboxyl group of one acid is linked to the amino group of the other.

1905–10; pept(ic) + -ide Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
peptide (ˈpɛptaɪd)
peptide bond See also polypeptide any of a group of compounds consisting of two or more amino acids linked by chemical bonding between their respective carboxyl and amino groups

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

peptide pep·tide (pěp'tīd')
Any of various natural or synthetic compounds containing two or more amino acids linked by the carboxyl group of one amino acid and the amino group of another.

pep·tid'ic (-tĭd'ĭk) adj.
pep·tid'i·cal·ly adv.
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
peptide   (pěp'tīd')  Pronunciation Key 
A chemical compound that is composed of a chain of two or more amino acids and is usually smaller than a protein. The amino acids can be alike or different. Many hormones and antibiotics are peptides.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Dozens of specimens of this frog were sacrificed to collect peptide samples for
  previous studies.
These are abnormal deposits of a protein called amyloid beta peptide, which
  appear to gum up the workings of nerve cells.
Cells in the gut sense when the bacteria get too close, and produce a peptide
  that kills some of them off when they do.
The candidate must have a broad skill set that includes molecular biology,
  protein biochemistry, peptide chemistry and biophysics.
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