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“codicil” in Latin

The English word codicil itself goes back to Latin caudex, through cōdicillus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

codicil
codicillus, codicilli (used as supplement to a will, or an informal testamentary document, in Plin., Epistulae, and Tac.). The codicil is invalid, is so much waste paper, codicilli pro non scriptis habendi (Plin., Epistulae, 2, 16, 1).

Quick answer

What is the Latin word for codicil?
The usual Latin words for “codicil” are cōdicillus, cōdĭcilli. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.