/
ˈsʌfɪks/
n.
  - a morpheme added at the end of a word to form a derivative (e.g. -ation).
 - Mathematics  another term for subscript.
 
v.
  
/also 
səˈfɪks/
 append, especially as a suffix.
Derivative
Etymology
C18: from mod. L. suffixum, neut. past part. (used as n.) of L. suffigere, from sub- ‘subordinately’ + figere ‘fasten’.