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intervillous lacuna

(ĭn′tər-vĭləs)
n.
  1. One of the spaces in the placenta that contain maternal blood and into which the chorionic villi project.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.