| 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. Source: Websters Dictionary (01 Mar 1998) |
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| keyhole deformity | Mucosal ectropion at the posterior edge of the anus following sphincterotomy at that location. (05 Mar 2000) |
| keyhole pupil | A pupil with a coloboma. (05 Mar 2000) |
| keyhole surgery | <procedure> A type of operation performed using a flexible endoscope via a small incision in the skin which allows the instrument to be passed into a cavity. There are now reservations by some experts regarding the use of this procedure in the cancer surgery. (16 Dec 1997) |