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Keyhole

From Biology-Online Dictionary | Biology-Online Dictionary
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Keyhole

1. A hole or apertupe in a door or lock, for receiving a key.

2. A mortise for a key or cotter. Keyhole limpet, any one of numerous clypeastroid sea urchins, of the genera Melitta, Rotula, and Encope; so called because they have one or more perforations resembling keyholes.