Definition of "XLR"

XLR¹

noun
plural XLRs
1. (often attributive) A kind of electrical connector, circular and having between three and seven pins, primarily used with professional audiovisual and stage lighting equipment.
  Quotations
  Larger snake cables often have elaborate multipin connectors that lead to either a group of XLRs or a metal box with a group of chassis-mounted XLRs.
  2013, Glen Ballou, Handbook for Sound Engineers, page 1318

XLR²

adjective
not comparable
1. (aviation) Initialism of extra long range.
2. (genetics) Abbreviation of X-chromosome linked recessive.