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plural vacuoles
(cytology) A large membrane-bound vesicle in a cell's cytoplasm.
A small empty or air-filled space or vacuity. quotations examples
This surface itself was not entirely homogeneous, but beneath it, seen as through ground glass, there were dim whitish patches or vacuoles, which varied constantly in shape and size.
1929, Sir Arthur Conan Doyle, When the World Screamed