- Any cavity or enclosed space serving as a reservoir, especially for chyle, lymph, or cerebrospinal fluid.
- An ultramicroscopic space occurring between the membranes of the flattened sacs of the endoplasmic reticulum, the Golgi complex, or the two membranes of the nuclear envelope.
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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.