Infix

pl:infiks An infix is an affix inserted inside another morpheme. This is not uncommon in Semitic languages, in which roots are composed of three or occasionally four consonants and are conjugated by changing the vowels and sometimes inserting consonants between them.

In addition, several infixlike constructions are often heard in plain English:

• Expletive infixation, a form of tmesis seen in profanity such as "Massa-fucking-chusetts" and "unbe-fucking-lievable"
• Meaningless epenthetic sounds, such as the "-iz-" or "-izn-" of hip-hop slang (e.g., hizouse for house; shiznit for shit)

In the syntax of notations used in mathematics and computer science, infix is used to describe an operator such as the usual addition sign + that is taken to bind to the variables immediately preceding and following them. See operator for more on the placement of operators.

• prefix : prefix notation Polish Notation
• postfix : postfix notation reverse Polish notation
• infix : infix notation

In chemistry, the infix is used to describe molecular structure in IUPAC nomenclature.

English has only a few arcane infixes that are listed in dictionaries. Chemical nomenclature includes the minuscule infixes -pe-, signifying complete hydrogenation (from piperidine); and -et- (from ethyl), signifying the ethyl radical C2H5. Thus, from picoline, we can derive pipecoline and from lutidine, we can derive lupetidine; from phenidine, we can derive phenetidine and from xanthoxylin, we can derive xanthoxyletin.

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