LATIN DICTIONARYLexicon Latīnum
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“collateral” in Latin

The English word collateral itself goes back to Latin latus, through collaterālis.

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

collateral
A collateral line (in pedigrees), linea transversa (opposed to linea directa: Vid :, under LINE, the passage from Paul, Dig., 38, 10, 9]. To stand in a collateral line of relationship to a family, *linea transversa contingere aliquem or alicujus domum. Collateral relationship, latus (“cognatio quae ex transverso procedit ad differentiam ejus quae est inter ascendentes et descendentes,” Facciol. sub voc.). A collateral ralation, ex lateribus cognatus (“sunt et ex lateribus cognati ut fratres sororesque.” Paul., Dig., 38, 10, 10).
Concurrent, accessory [Vid: ADDITIONAL].
Indirect, Vid.

Quick answer

What is the Latin word for collateral?
The usual Latin words for “collateral” are ferō, concurrō. 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.