Webster's Revised Unabridged Dictionary · 1913

Red-gum

Red-gum (-g?m`) , noun

[Old English reed gounde; Anglo-Saxon reád red + gund matter, pus.]

1.
(Medicine) An eruption of red pimples upon the face, neck, and arms, in early infancy; tooth rash; strophulus. — Good
2.
A name of rust on grain. See Rust.