semidiurnal

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adjective

Twice daily (usually of tides).

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Meanings

adjectivesemidiurnal (not comparable)
  1. not comparableTwice daily (usually of tides).
  2. not comparableAccomplished in half a day.
  3. not comparablebiologyFlying in twilight.
nounsemidiurnal (plural semidiurnals)

plural semidiurnals

  1. A tide that occurs twice daily.

Origin

From semi- + diurnal.

Full word history & related roots →
Cite this entry
APA

semidiurnal. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/semidiurnal

MLA

“semidiurnal.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/semidiurnal. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “semidiurnal,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/semidiurnal.

Source: semidiurnal on Wiktionary, CC BY-SA 4.0.