semidiurnal

[ sem-ee-dahy-ur-nl, sem-ahy- ]
/ ˌsɛm i daɪˈɜr nl, ˌsɛm aɪ- /

adjective

pertaining to, consisting of, or accomplished in half a day.
occurring every 12 hours or twice each day.

Origin of semidiurnal

First recorded in 1585–95; semi- + diurnal

Example sentences from the Web for semidiurnal

  • The semidiurnal tidal forces vanish at the Pole and are very small over the entire Arctic Ocean.

    The North Pole |Robert E. Peary

British Dictionary definitions for semidiurnal

semidiurnal
/ (ˌsɛmɪdaɪˈɜːnəl) /

adjective

of or continuing during half a day
occurring every 12 hours