[ uh-nahy-uh-ley-ter ]
/ əˈnaɪ əˌleɪ tər /


a person or thing that annihilates.
Mathematics. the set of all linear functionals that map to zero all elements of a given subset of a vector space.

Origin of annihilator

First recorded in 1690–1700; annihilate + -or2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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