HM noun 4pronoun 2 noun4 •Initialism of heavy metal.When girls appropriate a male-dominated form like HM, can they discard its sexist content without replacing it with something else? — 1982 •(India) Initialism of Home Minister. •(US) Abbreviation of hospital corpsman. •Initialism of hidden machine pronoun2 •Initialism of His Majesty (the title of a king). •Initialism of Her Majesty (the title of a queen).