There are 14 standard functions in the c...r group, and they are generally
pronounced without inserting extraneous vowels. The fluent lisper can
easily communicate them orally with repeated neutral voicings of short `a'
and neutrally voiced `d' sounds. `a' syllables tend to be accented,
helping differentiate. Hence the synonym for first is KAr, for second
KA-dr, third KA-d-dr, but the cdr of the car is kDAr, which is different
than KA-DAr.
The a vowel tends to follow the English language pronunciation conventions.
For example, car is pronounced the same as the word for the vehicle, but
the a in cadr is the same as in cat. (An a sound is modified by a following
r, but regional variances apply. A Bostonian makes a bigger difference
between car and cat than does a New Yorker.)
None of this pronunciation stuff derives from usage in actual non-Lisp 7090
series assembly programming, which I did in my distant youth.