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From Biology-Online Dictionary | Biology-Online Dictionary
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To beat, or pulsate, with more than usual force or rapidity; to beat in consequence of agitation; to palpitate; said of the heart, pulse, etc. My heart Throbs to know one thing. (Shak) Here may his head lie on my throbbing breast. (Shak)

Origin: OE. Robben; of uncertain origin; cf. Russ. Trepete a trembling, and E. Trepidation.

A beat, or strong pulsation, as of the heart and arteries; a violent beating; a papitation: The IMPATIENT throbs and longings of a soul That pants and reaches after distant good. (Addison)