在语言学之构词学中，插缀（Transfix）指在词根（闪语族词根）中插入的不连续词缀，属于构词学的词根活用式系统，可在多种闪语中见到。

不连续词缀为语音组件在单词中不连续，围绕着构成词根的语音摊开词缀。词根常常是一系列难懂的三个辅音，虽然单辅音、双字母、四字母词根也实际存在。三辅音词根的例子如阿拉伯语的 d–r–b ，可以曲折为 daraba （打击）和 idribunna （打击他们（阴性））。一般认为三辅音词根是最普遍的型态，部分语言学家断定双字母词根可能实际上是默认的，但至少有一位学者怀疑这些主张的合法性。

In linguistic morphology, a transfix is a discontinuous affix which is inserted into a word root, as in root-and-pattern systems of morphology, like those of many Semitic languages.

A discontinuous affix is an affix whose phonetic components are not sequential within a word, and instead, are spread out between or around the phones that comprise the root. The word root is often an abstract series of three consonants, though single consonant, biliteral, and quadriliteral roots do exist. An example of a triconsonantal root would be d–r–b in Arabic, which can be inflected to create forms such as daraba 'he beat' and idribunna 'beat them (feminine)'. While triconsonantal roots are widely considered to be the most common state, some linguists posit that biliteral roots may in fact be the default, though at least one scholar is skeptical of the legitimacy of these claims.