How to Say "Mirage" in Japanese

蜃気楼

shinkirō[ɕĩŋʲkʲiɾo̞ː]

The Japanese word for mirage is 蜃気楼 (shinkirō).

蜃気楼 refers to the optical phenomenon of a mirage.

Meaning: an optical phenomenon (noun)

What does it mean word for word?

The word begins with the kanji 蜃, which refers to a legendary giant clam or sea monster.

shinkirō

The kanji 楼 in 蜃気楼 specifically refers to a multi-storied tower or pavilion, reflecting the ancient belief that mirages looked like floating palaces.
The kanji 蜃 represents a mythical giant clam that was believed to breathe out a mist which created illusory castles to lure people in. This legend is why the word for 'mirage' in Japanese is tied to a sea creature.
While 蜃気楼 is the standard term, Japanese also uses 陽炎 ('kagerō') for the specific shimmering heat haze seen on hot roads, which is a different physical phenomenon than a true mirage.

蜃気楼は幻影だと言われている。
A mirage is said to be an illusion.
This sentence is useful for illustrating the idea that a 蜃気楼 is considered an illusion.
Tatoeba #77077 by arnab, translation #326642 by CM
最近の科学記事で、蜃気楼の光学的な特性が研究されています。
In recent scientific articles, the optical characteristics of mirages are being studied.
砂漠の遠くに蜃気楼が見える。
Sabaku no tooku ni shinkirou ga mieru.
A mirage is visible in the distance of the desert.

Yui and Youta are looking at a distant view on a hot summer day.

結衣 Yui

陽太、あれは蜃気楼かな？
Youta, are wa shinkirou kana?
Youta, I wonder if that is a mirage?
陽太 Yota

そうだね、すごく揺れているよ。
Sou da ne, sugoku yurete iru yo.
You're right, it's shaking a lot.
結衣 Yui

まるで幻みたいだね。
Marude maboroshi mitai da ne.
It looks just like an illusion.
陽太 Yota

暑さのせいだと思うよ。
Atsusa no sei da to omou yo.
I think it is because of the heat.

Sources

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