Dictionary

semidiurnal

adjective semi·di·ur·nal \-dī-ˈər-nəl\

Definition of SEMIDIURNAL

1
:  relating to or accomplished in half a day
2
:  occurring twice a day
3
:  occurring approximately every half day <the semidiurnal tides>
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First Known Use of SEMIDIURNAL

1594

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2 ENTRIES FOUND:
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