干扰 (gān rǎo) literally combines 干 (gān), meaning 'to do' or 'to involve oneself', and 扰 (rǎo), meaning 'to disturb' or 'to trouble'. Together, they form a word that denotes unwanted influence, disruption, or obstruction—especially in technical, medical, or daily life contexts. As a noun, it refers to the disruptive factor itself (e.g., electromagnetic interference); as a verb, it means 'to interfere with' or 'to disrupt' an activity, signal, process, or state.

The term is frequently used in science and medicine—for instance, when describing how background noise affects hearing tests, or how certain medications interfere with lab results. It also appears in everyday speech to describe distractions during study or work. While neutral in register, it carries a slightly negative connotation, implying something undesirable impeding normal function. It’s commonly paired with verbs like '产生' (to produce), '避免' (to avoid), or '消除' (to eliminate), and with nouns like '信号' (signal), '实验' (experiment), or '睡眠' (sleep).