三み 十そ 日か also: つごもり · みそ · かいじつ
Related words 月末 is the everyday word for 'the end of the month' as a general period, while 三十日 specifically names the final calendar day itself and sounds more traditional.
末日 is a formal, often business/legal term for the last day of a month or deadline period, whereas 三十日 is the more traditional, literary word for the same day.
晦日 is the last day of any month, while 大晦日 refers specifically to the last day of the year, December 31st.
Written forms 三み 十そ 日か
High-priority spelling and reading for this word. Be aware that 三十日 can also be read differently in ordinary date-counting contexts; this word is specifically みそか , meaning the last day of a month.
晦日 Usage 64% i Usage for this spelling across all readings, not one reading alone.
みそか
Conventional spelling for the last day of a month; familiar from 大晦日 , the last day of the year. Standalone 晦日 is more traditional or formal than everyday 月末 .
つごもり
Attested older or literary reading for 晦日 .
かいじつ
Rare Sino-Japanese-style reading of 晦日 ; not the normal everyday reading.
晦 Usage 24% i Usage for this spelling across all readings, not one reading alone.
みそか Usage 11%
つごもり Usage 2%
みそ
かいじつ
Etymology みそか is associated with 三十日 , literally 'thirtieth day'; historically the last day of a month was tied to a roughly thirty-day month. 晦日 and 晦 are conventional kanji spellings connected with the month's end. The exact historical development is summarized cautiously here rather than treated as a fully verified etymology.
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