suffix (n.) Look up suffix at Dictionary.com
1778, from Modern Latin suffixum, noun use of neuter of Latin suffixus "fastened," past participle of suffigere "fasten, fix on, fasten below," from sub "upon" (see sub-) + figere "fasten" (see fix (v.)). Related: Suffixal.
suffix (v.) Look up suffix at Dictionary.com
in the grammatical sense, 1778, from suffix (n.). Earlier "to put or place under" (c.1600). Related: Suffixed; suffixing.