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.
You will also like...
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas o..
Developmental biology is a biological science that is primarily concerned with how a living thing grows and attains matu..
Regulation of Biological Systems tutorials are focused on the modulation of biological systems from cell to population l..
Neurons generate electric signals that they pass along to the other neurons or target tissues. In this tutorial, you wil..