Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of semidiurnal is as below...

Semidiurnal :: Semidiurnal (a.) Pertaining to, or traversed in, six hours, or in half the time between the rising and setting of a heavenly body; as, a semidiurnal arc..

Flood :: Flood (v. i.) The flowing in of the tide; the semidiurnal swell or rise of water in the ocean; -- opposed to ebb; as, young flood; high flood..

Semidiurnal :: Semidiurnal (a.) Pertaining to, or accomplished in, half a day, or twelve hours; occurring twice every day..

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