[f. ANNIHILATE v. + -OR, as if a. L. *annihilātor.] He who, or that which, annihilates or utterly destroys.

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1698.  Congreve, Way of World, IV. ix. (Jod.). Witwood, you are an annihilator of sense.

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1841.  Hor. Smith, Moneyed Man, III. xi. 325. Steam … the uniter of nations, the annihilator of distance.

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  ¶  Occas. in comb., as smoke-annihilator, etc.

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