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Watch Words


The following pages are a glossary of terms associated with horology, watches and watchmaking. Please click on one of the links or glossary terms below to learn more about them. Most of the terms are enhanced with detailed imagery. If you would like us to list any other words that you think may be helpful, please contact me direct We will update the glossary frequently.


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Unidirectional Rotating Bezel

A rotating bezel, often found on divers’ watches, that moves only in a counterclockwise direction and makes it easy to measure elapsed time. It is particularly useful for divers so they cannot accidentally rotate it in the wrong direction, which could cause them to miscalculate their dive times. Because the bezel moves in only one direction, the diver can err only on the side of safety when timing his dive. Many divers’ watches are ratcheted, so that they lock into place for greater safety.

The C60 Trident Pro featuring a uni-directional aluminium bezel.

Unidirectional rotating bezel



Universal Time

The mean solar time of the Greenwich meridian, counted from noon to noon, Often confused with the mean time notion.


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