from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The membranous sac filled with serous fluid that encloses the heart and the roots of the aorta and other large blood vessels.

from The Century Dictionary.

  • noun In anatomy and zoology: A somewhat conically shaped membranous sac, inclosing the heart and the origin of the great vessels.
  • noun A blood-sinus or special cavity beneath the carapace of a crustacean, in which the heart is suspended by ligaments and arteries, but not otherwise connected.
  • noun In mollusks, the spacious dorsal cœlom or body-cavity which is traversed by the contractile vessel which acts like a heart.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Anat.) The double baglike fold of serous membrane which incloses the heart.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun anatomy, cardiology A serous membrane that surrounds the heart allowing it to contract.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a serous membrane with two layers that surrounds the heart


from The American Heritage® Dictionary of the English Language, 4th Edition

[New Latin, from Greek perikardion, from perikardios, around the heart : peri-, peri- + kardiā, heart; see kerd- in Indo-European roots.]



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    July 12, 2007