About
The character 阈, written as 閾 in its traditional form, is a phono-semantic compound. It combines the semantic radical 门 (門), meaning "door" or "gate", with the phonetic component 或. This semantic element grounds the character's meaning in the architectural context of entryways. It specifically refers to the threshold, the piece of wood or stone at the bottom of a doorway that one steps over when entering. While originally describing this physical boundary, the meaning later expanded into abstract and scientific domains to denote a limit, boundary, or threshold value, such as a psychological threshold or the minimum stimulus required to elicit a response.
Etymology Hide
