Harry Thurston Peck, Harpers Dictionary of Classical Antiquities (1898)

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Plaustrum

（ἅμαξα). A wagon or two-wheeled cart. If it had four wheels, it was styled plaustrum maius (Cato , R. R. x. 2). It was used for

Plaustrum. (Ginzrot.)

heavy burdens, and was generally drawn by oxen, but sometimes by mules. The wheels of the plaustrum had no spokes.