Kairos is an appeal to the timeliness of the argument. Two common rhetorical devices are irony and metaphor. The use of irony in rhetoric is primarily to convey to the audience an incongruity that is often used as a tool of humor in order to deprecate or ridicule an idea or course of action.
Definition of irritant for English Language Learners. : 1  something that makes part of your body sore and painful. : 2  something that is unpleasant or annoying : something that irritates you.
The definition of astringent refers to a material that will cause body tissues to shrink, and helps to control bleeding and secretions. A cosmetic that will clean your skin and close your pores is an example of an astringent. YourDictionary definition and usage example.