Suffix \Suf"fix\, n. [L. suffixus, p. p. of suffigere to fasten on, to affix; sub under + figere to fix: cf. F. suffixe. See Fix.]

1. A letter, letters, syllable, or syllables added or appended to the end of a word or a root to modify the meaning; a postfix.

2. (Math.) A subscript mark, number, or letter. See Subscript, a.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Suffix \Suf*fix"\, v. t. [imp. & p. p. Suffixed; p. pr. & vb. n. Suffixing.]

To add or annex to the end, as a letter or syllable to a word; to append.

Source: Webster's Revised Unabridged Dictionary (1913)