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According to [jisho](http://jisho.org/search/%E5%AD%92%20%23kanji), one of the
kun'yomi readings for the character 孒 is 「ひだりのうでがない」. This feels like it is
not an official reading, but is that reading ever used in conjunction with
this kanji? It feels like a humorous descriptive for the shape of the kanji,
but is there any basis for it?
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kanji readings
Reading of 孒 as ひだりのうでがない
Some people believe many kanji have this type of lengthy and descriptive kun-
readings. See: [長訓読み](http://www.akatsukinishisu.net/kanji/nagakun/) and
[訓読みが長い漢字](https://enpedia.rxy.jp/wiki/%E8%A8%93%E8%AA%AD%E3%81%BF%E3%81%8C%E9%95%B7%E3%81%84%E6%BC%A2%E5%AD%97).
There's also a [song by Hatsune Miku](https://youtu.be/__Qo8tFxlGo).

Many webpages say these weird readings are basically based on the 字訓索引 ("kun-
reading Index") of [大漢和辞典](https://en.wikipedia.org/wiki/Dai_Kan-Wa_Jiten),
probably the largest kanji dictionary ever published in Japan. The longest
"kun-reading" in the kun index of this dictionary is ほねとかわとがはなれるおと for 砉. I
don't own this dictionary and cannot check if ひだりのうでがない exists for 孒, but if
it does, it might be called "official" and "authoritative".

In reality, these strange "kun-readings" were listed in the index of course
only for convenience sake. See the [discussion
here](http://d.hatena.ne.jp/hakuriku/20040317#p1). I believe no one have read
this kanji as such seriously.
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As respondents have suggested, these are often elaborately jokey, in the
manner of the convoluted English puns loved by the Victorians. But they can be
useful mnemonics. For example, I can always remember (not that I often need
to) the old form of 寿(ことぶき) , which is 壽, by a mnemonic composed of the
individual elements in the kanji, reading from top down:
さむらい(士)のフエ[は]いち(一)インチ(吋) , "The samurai's flute is one inch long". Similarly,
the old form of 桜 (さくら) , which is 櫻 , can be deconstructed as にかいのおんなにきをつけて
(二貝の女に木をつけて - "add ki to two kai and onna"), which can also be interpreted as
二階の女に気をつけて, "Beware of the woman on the second floor". There are lots more.
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A mosquito larva is written as **[孑孒]【boh-fura】(ぼうふら)** in kanjis. It swims in
the water by wiggling the body to right and left.

[Here](https://twitter.com/kiki_isiki/status/241847306108952576) is a tweeted
message relating to the theme you posted as:

Though I knew a mosquito larva is written as **[孑孒]【boh-fura】** in kanjis,
after having known that the _kanji_ **孑** means a child without the right arm
and the other _kanji_ **孒** means a child without the left arm I would
sympathize with larvae lacking in the arms and the legs a little, and I feel
even a certain deep impression when I see them flying in the sky freely with
obtaining even wings as well as the arms and legs after maturing into
mosquitoes by killing them by crushing at the same time.
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_Kun'yomi_ are, historically speaking, Japanese translations of the Chinese
definitions of _kanji_. Whether or not something is an official reading of a
_kanji_ is dependent on what sources are considered authoritative.

For _kanji_ which aren't in a common character list like _Jōyō_ , you would
inevitably find that the authoritative source has a high chance of ultimately
getting its translation-reading from some ancient Chinese dictionary, if the
_kanji_ is not really used in Japanese (as a single character). The length of
the _kun'yomi_ in this case is then, unsurprisingly, correlated to the length
of the Chinese definition. Examples, some taken from the other responses:

「暤」：[ _Shuowen_](https://en.wikipedia.org/wiki/Shuowen_Jiezi): 晧旰也 ( _bright,
clear_ ). _Kun'yomi_ : **あきらか**

「孒」： _Shuowen_ : 無左臂也. _Kun'yomi_ : **[ひだり]{左}｜の｜[うで]{腕}｜が｜[な]{無}い** (Note:
Chinese「臂」means _arm_ )

「砉」：[ _Guangyun_](https://en.wikipedia.org/wiki/Guangyun): 皮骨相離聲. _Kun'yomi_ :
**[ほね]{骨}｜と｜[かわ]{皮}｜とが｜[はな]{離}れる｜[ おと]{音}** (Note: Chinese「聲」means _sound_ )

「閄」：[字彙補](https://ja.m.wikipedia.org/wiki/%E5%AD%97%E5%BD%99%E8%A3%9C)：隱身忽出驚人之聲也.
_Kun’yomi_ : **[物陰]{隱身}｜から｜[急に飛び出して]{忽出}｜[人を驚かせる]{驚人}｜時に発する｜[声]{聲}**

The _kun'yomi_ above are actually all equally obscure; the only difference is
that **あきらか** is a one-word translation, matching the single-word adjective in
Chinese 晧旰, while the others are translated with entire sentences, matching
the whole Chinese sentence.

If Japanese does not have a _de-facto_ tradition of using a single _kanji_ to
represent entire sentences, then such readings wouldn't be used in conjunction
with the _kanji_.
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