(carpentry) fox wedge

A tool used to extract teeth by a motion resembling that of turning a key.

plural of Key lime

A device for transmitting Morse code by hand, still used by radio amateurs today.

Dated form of keyword.

(databases) A column (or group of columns) in a relational table that identifies another table, so that items in the two tables can be conceptually linked.

The unpublished key in asymmetric cryptography.

A restrained or subdued situation. / (photography) A dark area of a photograph with little contrast.

(computing, databases) In the design of a database table, the primary key (abbreviated PK) is selected among the non-empty set of candidate keys. The PK is a column (or an irreducible group of columns) able to identify every row of the table.

(engineering) A key split at one end like a split pin, for the same purpose. / (computing) A key value used to identify where to split the children of a parent node in a B-tree or similar data structure.