火曜日

Taken apart

1. 火曜

   かよう

   Mars (the planet)

2. +

3. 日

   び (from ひ)

   day

Select a part to see every word so far that is taken apart with it.

Written with 火曜日

In a sentence

• 火曜日(かようび)はお暇(ひま)ですか。

  Are you free on Tuesday?

  Tatoeba #186643, translation #23779

• 火曜日(かようび)に国会(こっかい)が開(ひら)かれる。

  The Diet will meet on Tuesday.

  Tatoeba #186646, translation #23782

Sentences are from Tatoeba (CC BY 2.0 FR), picked by fixed rules from a dated export and shown unchanged. Nobody has reviewed them one by one.

What Wiktionary says

Quoted line by line from Wiktionary's Etymology section for this reading, taken from one dated dump so it can't change underneath us. Nothing below is paraphrased.

• “/kaeubi/ → /kajoːbi/”
• “Compound of 火曜 (kayō, “Mars (the planet)”, in reference also to the day for that planet, as originally imported from Chinese astrology in the Heian period) + 日 (hi, “day”).”
• “The compound form suffixed with 日 (hi, “day”) appears in common use from the Meiji period with the promulgation of the Gregorian calendar. See also Names of the days of the week on Wikipedia.Wikipedia”

Source: Wiktionary: 火曜日 (dump of 2026-09-02), available under CC BY-SA 4.0. Reading, meaning and part of speech from JMdict, and kanji readings from KANJIDIC2 (EDRDG).

What the labels mean

混種語 Hybrid

Words that mix layers, e.g. a native part with a Chinese one.

Compound

Two or more words or stems joined into one.

Rendaku

The first sound of the second part voices when two native words join (kami → -gami).

Borrowing

Taken over from another language.

Sound change

The pronunciation shifted over the centuries.