Wikipedia mentions 4 subgroups of affixes:
prefix, the affix is in front of the word
suffix, the affix is behind the word
- infix, the affix is within the word
- circumfix, the afix is separated into two parts, before and after the word
Now, in Arabic, the derivation of words is based on roots and patterns, to form a real word one has to combine the root and pattern, so that they are interlocked.
Similar to this, in Chinese one can combine, for instance, 起来 and 请客 by interlocking them into: 请起客来.
How is this kind of affixation called ?