Bierce defines it as "His"

• Pronoun on a towel
• Term on terrycloth
• Half of a matched pair
• "I'm Yours and I'm ___" (1969 Johnny Winter song)
• Half a matched set, perhaps
• Word on a towel
• Word on one of a pair of coffee mugs
• Bathrobe word
• Obnoxious vanity plate

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Hers \Hers\ (h[~e]rz), pron. See the Note under Her , pron.