The top or upper surface of a cart, or a structure built on top of a cart for carrying goods.
Compound word combining 'cart' (from Old Norse 'kartr') and 'top' (from Old English 'top'). Cartop is a straightforward descriptive term that emerged from practical medieval commerce and agriculture.
The cartop design was crucial to medieval commerce—merchants learned that how you stacked and secured goods on top of a cart could mean the difference between profit and loss, especially on bumpy roads.
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