The Free On-line Dictionary of Computing (30 December 2018):

distfix

    ("distributed fixity"?) A description of an
   operator represented by multiple symbols before, between,
   and/or after the arguments.

   The classical example is the C conditional operator, "?:"
   which is written

   	E1 ? E2 : E3

   If E1 is true it returns E2 otherwise it returns E3.  Several
   functional programming languages, e.g. Hope, Haskell,
   have similar operators ("if E1 then E2 else E3").

   Objective C messages are effectively distfix operator
   applications:

   	getRow:row andColumn:col ofCell:cell

   is a message with three arguments, row, col, and cell.

   (1997-01-21)