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Definitions from the Web

Semidiurnal

Definition: Relating to or occurring twice in a day.

Part of Speech: Adjective

Sense:

1. Occurring twice in a 24-hour period.
2. Having a period of approximately 12 hours.

Usage:

1. The tides are semidiurnal, with two high tides and two low tides each day.
2. The semidiurnal rhythm of the human body includes the alternation between sleep and wakefulness.

Related Products:

• Semidiurnal Clocks
• Semidiurnal Tide Tables