Meaning and pronunciation of 通目


Recently I've been reading 永田カビ's 一人交換日記, and have come upon the word 通目
there, used in every "chapter" heading. Judging from context, I think this
word would mean something like "entry", but I haven't been able to find it in
the standard dictionaries (広辞苑 and the 国語大辞典 have it listed, but the meanings
listed there are completely unrelated).

How is 通目 read? What does it mean?




The word 通目 is the combination of the counter 通{つう} for letters, messages,
entries, etc. ([see entry 2. here](https://jisho.org/word/%E9%80%9A)), and the
[ordinal number suffix](https://japanese.stackexchange.com/a/68761/32952) 目{め}
([see entry 17. here](https://jisho.org/search/%E7%9B%AE)):

> 5通の手紙。Five letters.

> 5通目の手紙。The 5th letter.

If I am not mistaken, as a combination of the aforementioned parts, the
pronunciation then should be 通目{つうめ}. Since this instance of 通目 can be broken
down to two simplier, separated entities, this is most likely why it doesn't
appear as a standalone entry in dictionaries.




The word 通目 is the combination of the counter 通{つう} for letters, messages,
entries, etc. ([see entry 2. here](https://jisho.org/word/%E9%80%9A)), and the
[ordinal number suffix](https://japanese.stackexchange.com/a/68761/32952) 目{め}
([see entry 17. here](https://jisho.org/search/%E7%9B%AE)):

> 5通の手紙。Five letters.

> 5通目の手紙。The 5th letter.

If I am not mistaken, as a combination of the aforementioned parts, the
pronunciation then should be 通目{つうめ}. Since this instance of 通目 can be broken
down to two simplier, separated entities, this is most likely why it doesn't
appear as a standalone entry in dictionaries.

