caddr

/ˈkɑːdədə/

caddr noun: car of the cdr of the cdr in Lisp. The third element in a list.

Noun

caddr (plural caddrs)

Car of the cdr of the cdr in Lisp. The third element in a list.
- Following the SEL in the control list are two elements (the cadr and caddr of the C list), both of which are themselves lists of instructions.1991, Peter M. Kogge, The Architecture of Symbolic Computers, page 156
- For example, in a procedure that manipulates a list data stream, we might know that the mode of the car of the list (that is the current message) is the same mode as the cadr (second message), caddr (third message), etc.1994, Evan Tick, Giancarlo Succi, Implementations of Logic Programming Systems, →ISBN, page 239

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.2000, Matt Kaufmann, Panagiotis Manolios, J Strother Moore, Computer-aided reasoning: an approach:
The caddr of output is the second prompt.2004, Scott, Programming Principles Of Mulltimedia Systems, →ISBN, page 608:

plural	caddrs

Contraction of car of the cdr of the cdr.

What does caddr mean?: Caddr means car of the cdr of the cdr in Lisp. The third element in a list.
How do you use caddr in a sentence?: 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.
What part of speech is caddr?: Caddr is a noun.
How do you pronounce caddr?: Caddr is pronounced /ˈkɑːdədə/.
What is the plural of caddr?: The plural of caddr is caddrs.

Adapted from Wiktionary: caddr (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated: 2026-09-02

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