93384
In cases where `日` is productively attached as a suffix to an already complete
word, what is the canonical reading of this character? I mean cases, when a
connecting article `の` is dropped and `日` becomes a suffix, but does not form
an entirely new word with its own meaning and reading.

  * `指定日` `していび` [読み方は](https://yomikatawa.com/kanji/%E6%8C%87%E5%AE%9A%E6%97%A5)
  * `予定日` `よていび` [読み方は](https://yomikatawa.com/kanji/%E4%BA%88%E5%AE%9A%E6%97%A5)
  * `出発日` `しゅっぱつび` [読み方は](https://yomikatawa.com/kanji/%E5%87%BA%E7%99%BA%E6%97%A5)
  * `支払日` `しはらいび` [読み方は](https://yomikatawa.com/kanji/%E6%94%AF%E6%89%95%E6%97%A5)
  * `振込日` `ふりこみび` Not found on [読み方は](https://yomikatawa.com/kanji/%E6%8C%AF%E8%BE%BC%E6%97%A5), found on a random [webpage](https://foundplanner.com/payment-date/).

These examples hint that `び` is the reading of the productive suffix. But is
it really so? Are there words that are formed this way, but the `日` there
would be read e.g. `ひ` or `にち`?

I could not find an entry describing this neither in 大辞林, EDICT, goo辞書 nor
weblio. That surprises me, because EDICT has a `n-suf` flag for such suffixes,
大辞林 either directly marks the word as `接尾` or describes its usage as
“名詞の下に付いて…”. `性` can stand as an example.

Is there any dictionary that would list this suffix with its reading?

Related:

  * [Understanding the reading of 日曜日](https://japanese.stackexchange.com/questions/93025/understanding-the-reading-of-%E6%97%A5%E6%9B%9C%E6%97%A5)
  * [日曜日，the different meanings and pronunciations of 日](https://japanese.stackexchange.com/questions/68850/%E6%97%A5%E6%9B%9C%E6%97%A5-the-different-meanings-and-pronunciations-of-%E6%97%A5)
  * [人 as a suffix. General rule for a reading?](https://japanese.stackexchange.com/questions/38226/%E4%BA%BA-as-a-suffix-general-rule-for-a-reading)
  * [人 - on'yomi ニン or ジン rule of thumb](https://japanese.stackexchange.com/questions/47770/%E4%BA%BA-onyomi-%E3%83%8B%E3%83%B3-or-%E3%82%B8%E3%83%B3-rule-of-thumb)
  * [What's the reading of -中 as a suffix?](https://japanese.stackexchange.com/questions/5369/whats-the-reading-of-%E4%B8%AD-as-a-suffix)
  * [The rules of kanji reading](https://japanese.stackexchange.com/questions/62021/the-rules-of-kanji-reading)
  * [How are the different pronunciations of kanji used, such as onyomi and kunyomi?](https://japanese.stackexchange.com/questions/17696/how-are-the-different-pronunciations-of-kanji-used-such-as-onyomi-and-kunyomi)
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2022-02-12T17:24:46.677
93380
2022-02-14T00:01:38.510
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question
kanji readings suffixes
Is び the reading for a productive suffix 〜日?
> In cases where 日 is productively attached as a suffix to an already complete
> word, what is the canonical reading of this character?

Assuming the "canonical reading" you seek means hiragana, then it's basically
**び**. This answer is based on my experience, instead of a documented set of
rules as I couldn't find any.

* * *

> Are there words that are formed this way, but the 日 there would be read e.g.
> ひ or にち?

Yes, the day of blessing - **天赦日** may be read as てんしゃ **にち** , although てんしゃび
may work too. I believe this meets your criteria as "日" here is indeed
_productively attached as a suffix, to an already complete word_. From such
point of view, 天赦日 is no different from 指定日 you specified as an example.

三が日 ends with にち, but this one doesn't meet your criteria, as it's kind of a
"one word".

But think about it... according to your criteria, even 翌日 may be applicable.
You asked for _" cases, when a connecting article の is dropped and 日 becomes a
suffix, but does not form an entirely new word with its own meaning and
reading."_ so 翌日 (よくじつ) might work depending on how one would interpret your
requirement. If you accept this, there are many more possible "canonical
readings" available.

* * *

> Is there any dictionary that would list this suffix with its reading?

I can't think of one that would provide the output you seek out of the box.
However, any dictionary should suffice if you could manipulate the data. As
you're seeking for information on the **trailing** character of a word, one
method would be to fetch all the words, and then filter the results to those
containing a 日 at the end.

This isn't limited to Japanese, but you may attach 日 to just about any word
and the result will probably make sense. Some of these made-up words become
popular among a local group and become a "standard" word, but not "dictionary-
worthy". It's similar to slang.

Here is a comparison with practical examples:

**帰社日** I bet many Japanese won't understand this word, let alone a
dictionary. However in the engineering industry this is a standard word. It's
the day an engineer dispatched to a client's office "returns" to the direct
employer's company to touch base. Clever word, isn't it?

**誕生日** This is definitely in the dictionary as it has established its
position as a "word".

So there are countless combinations of "blah" + 日 out there, and you can
create one yourself too. But no matter how popular it gets, it's just a pseudo
word until the scholars approve it.
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answer