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CATEGORY: feature
DEFINITION: A generic term for a wall opening that cannot be described more specificially.
aperture pattern
DEFINITION: Any open space or pattern of open spaces between the portions of solid matter on pollens that can be used to distinguish pollen classes.
synthetic aperture radar
CATEGORY: technique
DEFINITION: A device which mathematically combines a series of radar echoes to generate an image by penetrating the ground and revealing hidden structures.

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