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I assume that ドア is a loanword from English, unless it's a big coincidence,
yet, it's in the top 200 most used Japanese words by frequency, in a Japanese
words by frequency list. What's the original Japanese word for door? Any idea
why they switched for the English one considering doors (or something similar
foldable perhaps to cover an entrance) had to exist in Japan before western
contact?
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2018-09-13T14:22:33.400
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word-requests loanwords history
What's the original Japanese word for door, other than the loanword ドア?
Western style doors are 扉{とびら} which actually more loosely translates to
"opening" I suppose. The sliding doors are called 障子{しょうじ}.

A linguist will have to answer the "why", although I suspect the simple answer
is "because it's cool to use foreign words". One path that foreign words take
to "common parlance" is through songs, so it wouldn't surprise me to find that
the first popularization of the word ドア came from a song.
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2018-09-13T14:40:38.270
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Your suspicion is leading you down the right path.

ドア is in fact a loanword from English. According to Jisho.org,
**[ドア](https://jisho.org/word/%E3%83%89%E3%82%A2)** is used in reference to a
Western-style door. This is a door that opens on hinges.

Before the introduction of Western-style doors, you are also correct to assume
that the Japanese had doors as well. These doors would slide on a track. In
English, we would refer to them as sliding doors. In Japanese, you will refer
to the Japanese-style door as **[戸｛と｝](https://jisho.org/word/%E6%88%B8)**.
That being said, I can't really say that I have heard 戸 used very often. I
think it's slightly archaic in its usage.

I will add that **[障子{しょうじ｝](https://jisho.org/word/%E9%9A%9C%E5%AD%90)** is
another word for the Japanese-style door, but it specifically refers to the
_paper_ sliding door (with a wood/bamboo frame). Other sliding doors would not
classify as 障子. I cannot say much about the usage, except it is used when you
are being specific about doors. It appears in many texts though.

There is one word that will be used in reference to both Western and Japanese-
style doors, **[扉｛とびら｝](https://jisho.org/word/%E6%89%89)**. It is a commonly
used word as well, because I recall having heard it used over the intercom
when trains or elevators were opening\closing the doors saying:

> 扉が(開き\閉まり)ます。ご注意ください。

The thing is that I have also heard ドア in those cases as well.
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