_The おお reading is out of the scope of this question - it might be involved in
the answer though_

I'm learning some vocabulary, and noticed that 大 was sometimes read だい,
sometimes たい.

The instance that surprises me the most is these two words:

> 大暑{たいしょ}
>
> 大寒{だいかん}

What is the reason why 大 is read たい in the first word, and だい in the second? I
would have expected it to be read the same in these two words, since they must
come from the same construct or be derived from the same rule.

Is there any rule that states when 大 should be read たい, and when it should be
read だい?
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2019-09-07T19:43:54.367
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2019-09-07T19:43:54.367
2020-06-17T08:18:27.500
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question
kanji readings multiple-readings
Reading of 大: だい or たい?