- a little cavity, pit, or cell, as a cell of a honeycomb.
- an air cell of the lungs, formed by the terminal dilation of tiny air passageways.
- one of the terminal secretory units of a racemose gland.
- the socket within the jawbone in which the root or roots of a tooth are set.
- any small pit, cavity, or saclike dilation, such as a honeycomb cell
- any of the sockets in which the roots of the teeth are embedded
- any of the tiny air sacs in the lungs at the end of the bronchioles, through which oxygen is taken into the blood
