obscuration

ob·scu·ra·tion (äb′skyo̵̅o̅ rā′s̸hən)

noun

an obscuring or being obscured

Etymology: L obscuratio

Converse of object

contain: The areas of the sky which contain heavy obscuration usually exhibit clouds of several degrees of opacity.

Adjective modifier

central: The calibration unit produces a beam that matches the telescope pupil very nicely except that it contains no central obscuration.

Modifies a noun

pattern: The obscuration pattern changes depending on the beam splitter selected.

Noun used with modifier

dust: The optical data allows a study of the dust obscuration.

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