Semantically, the meaning of a compound is often i ___________,

Semantically, the meaning of a compound is often i ___________, not always being the sum total of the meanings of its components.
【正确答案】：idiomatic
【题目解析】：在形态学章节内，除了派生法，还讲了另外一个构词法即复合法，并解析了复合词在拼写、句法、语义、语音方面的四大特征。语义方面，复合词的意义并非组成词素意义的相加，如hotdog并不是“热”和“狗”意义的相加，其复合词的意义通常具有习语性，需要考查词源并参考字典才能把握其准确含义。