Etymology
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cardboard (n.)

"stiff kind of paper," 1839, from card (n.1) + board (n.1). Figurative sense is from 1893. An earlier word for the same stuff was card paper (1777).

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Definitions of cardboard
1
cardboard (n.)
a stiff moderately thick paper;
Synonyms: composition board
2
cardboard (adj.)
without substance;
cardboard caricatures of historical figures
Synonyms: unlifelike
From wordnet.princeton.edu