noun
Dated term for a mirage, especially a superior mirage or fata morgana seen at sea. Modern Japanese more commonly uses 蜃気楼 (しんきろう).
See also: 蜃気楼
古い文献では、海上に現れる蜃気楼を「海市」と記すことがある。
In old documents, a mirage appearing at sea is sometimes written as 海市.