Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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-er1 one that performs or is associated with (such) an action, activity, or thing. [4 definitions]
-or1 a variant of -er1.
-or2 activity; quality; condition; characteristic.
heth the name of the eighth letter of the Hebrew alphabet.
or used to indicate alternatives. [3 definitions]
OR1 abbreviation of "Oregon," a northwestern U.S. state on the Pacific coast between Washington and California.
OR2 abbreviation of "operating room."