of, in, on, or pertaining to the chest or breast; thoracic.
worn on the breast or chest.
proceeding from the heart or inner consciousness.
Speech. (of a vocal quality) appearing to come from resonance in the chest; full or deep.
of or for diseases of the lungs.
Anatomy. a pectoral part or organ, as a pectoral muscle.
something worn on the breast for ornament, protection, etc., as a breastplate.

1400–50; (noun) late Middle English < Latin pectorāle, noun use of neuter of pectorālis of the breast (pector-, stem of pectus breast + -ālis -al1); (adj.) < Latin pectorālis

pectorally, adverb
interpectoral, adjective
postpectoral, adjective
prepectoral, adjective
subpectoral, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pectoral (ˈpɛktərəl)
1.  of or relating to the chest, breast, or thorax: pectoral fins
2.  worn on the breast or chest: a pectoral medallion
3.  rare heartfelt or sincere
4.  a pectoral organ or part, esp a muscle or fin
5.  a medicine or remedy for disorders of the chest or lungs
6.  anything worn on the chest or breast for decoration or protection
[C15: from Latin pectorālis, from pectus breast]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1578, "pertaining to the breast," from L. pectoralis "of the breast," from pectus (gen. pectoris) "breast, chest." The noun, short for pectoral muscle, is attested from 1758. Slang noun pec is first recorded 1966.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pectoral pec·to·ral (pěk'tər-əl)

  1. Relating to or situated in the breast or chest.

  2. Useful in relieving disorders of the chest or respiratory tract.

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
pectoral   (pěk'tər-əl)  Pronunciation Key 
Located in or attached to the chest, as a pectoral fin or a pectoral muscle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
On his left pectoral is a skull with one eyeball dangling from the socket by a cord of veins.
She could also rest her head on his warm pectoral, her hand on the third can to the right in his six-pack.
He oxygenates the eggs by fanning them with his pectoral fins.
They are medium-size sharks, with thick, stout bodies and long pectoral fins.
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