歧义句构（amphibology, amphiboly）或歧义结构系指因歧义的文法结构，导致一个句子能以多种不同方式理解的情形。

例一

他是我刚认识的小明的哥哥

可解作「我刚认识的小明」「的哥哥」，或「我刚认识的」「小明的哥哥」。

例二

**和花莲的某些地方

可解作「**和花莲的」「某些地方」，或「**」「和」「花莲的某些地方」。

Syntactic ambiguity, also called amphiboly or amphibology, is a situation where a sentence may be interpreted in more than one way due to ambiguous sentence structure.

Syntactic ambiguity arises not from the range of meanings of single words, but from the relationship between the words and clauses of a sentence, and the sentence structure underlying the word order therein. In other words, a sentence is syntactically ambiguous when a reader or listener can reasonably interpret one sentence as having more than one possible structure.