What does black gum mean?
• BLACK GUM (noun) The noun BLACK GUM has 2 senses: 1. columnar tree of eastern North America having horizontal limbs and small leaves that emerge late in spring and have brilliant color in early fall 2. a small mallee with rough dark-colored bark toward the butt; yields a red eucalyptus kino gum Familiarity information: BLACK GUM used as a noun is rare.