from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The membranous sac filled with serous fluid that encloses the heart and the roots of the aorta and other large blood vessels.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A serous membrane that surrounds the heart allowing it to contract.
from the GNU version of the Collaborative International Dictionary of English
- n. The double baglike fold of serous membrane which incloses the heart.
from The Century Dictionary and Cyclopedia
- n. In anatomy and zoology: A somewhat conically shaped membranous sac, inclosing the heart and the origin of the great vessels.
- n. 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.
- n. In mollusks, the spacious dorsal cœlom or body-cavity which is traversed by the contractile vessel which acts like a heart.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a serous membrane with two layers that surrounds the heart
New Latin, from Greek perikardion, from perikardios, around the heart : peri-, peri- + kardiā, heart; see kerd- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)