irritation
/ˌɪrɪˈteɪʃən/noun
mass noun
1- the state of feeling annoyed, impatient, or angry恼怒; 不耐烦; 生气。
1.1
- count noun a cause of this刺激物; 恼人的事; 烦心事：
the minor irritations of life.
生活中琐碎的烦心事。
1.2
- the production of inflammation or other discomfort in a bodily part or organ发炎; 疼痛; 不适。
1.3
- Biology the stimulation of an organism, cell, or organ to produce an active response【生】刺激（作用）, 兴奋。
词源
late Middle English: from Latin irritatio（n-）, from the verb irritare （see IRRITATE）.