A substance made from the sap of various tropical plants, and used for erasing pencil marks, and many other purposes. Pronounce Indirubber.
“He was a man with an indiarubber coat on. Indiarubber shoes, an indiarubber cap, and in his pocket an indiarubber purse, and not a cent in it.” —Cyclopædia of American Biography (Charles Goodyear), vol. ii. p. 684.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894