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occulter
Definitions
[], (Noun)
Definitions:
- Something that occults; specifically (a) a device for temporarily cutting off a lighthouse light; (b) a device in a telescope or other instrument for cutting off the direct light of the sun or other bright object.
Phrases:
Origin
:
early 20th century; earliest use found in Encyclopaedia Britannica. From occult + -er
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definition by Oxford Dictionaries