If we let x denote the tree (1 2 3), then the car of x is 1, the cdr of x is (2 3), the cadr of x is 2, the caddr of x is 3, and the cdddr of x is nil.
Source: wiktionary
Cadr
//ˈkɑːdə//
Synonyms for "cadr"
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.