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For the life of me I cannot track down the bolded word in Jisho. I expected it
to be the adverbial form of an い-adjective, but ぐろい is not listed (just グロい,
which seems wrong in the context).

> 空は青 **ぐろく** 、一面の星がまたたいていました。<- Excerpt from よだかの星

I don't like to ask for a single word to be translated like this... but since
I can't even **find** it (or any possible dictionary forms like ぐろくる, ぐろい,
etc) in a dictionary, I'm hoping there might be something more to learn here.
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translation
What conjugation of what word is ぐろく?
青ぐろく is the continuative/adverbial form of 青黒い(so the ぐろく is only a part of
the word)
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> 「空{そら}は青{あお}ぐろく、一面{いちめん}の星{ほし}がまたたいていました。」

As you know (I hope), **_all verbs and adjectives conjugate in Japanese_** ,
but only the dictionary forms can usually be found in the dictionary. It is,
therefore, imperative that one learn how verbs and adjectives conjugate even
if it might be a pain in the you-know-where. You will only thank yourself for
mastering it because, frankly, there is no such thng as being even semi-fluent
in Japanese if you cannot conjugate words freely.

「ぐろく」 is only part of the word 「青ぐろく」.

「青ぐろく」 is the 連用形{れんようけい} ("continuative form") of the adjective 「青ぐろい/青黒い」
("bluish-black").

(Whenever you see an unfamiliar word placed **_mid-sentence_** , think of the
possibility of it being in the 連用形. There have been quite a few questions
about the 連用形 without the questioners realizing that they are the 連用形 of the
verbs and adjectives that they have long been familiar with.)

Thus, the sentence means:

> "The sky was bluish-black **_and_** the stars all around were blinking."

**To say "and" is the function of the 連用形 here. You state something and
continue to say something else**.

Here is how the adjective 「青黒い」 conjugate.

青黒 **かろ** （う）、青黒 **かっ** （た）、青黒 **く** /青黒 **く** （ない）、青黒 **い** 、青黒 **けれ** （ば）

The parts in **bold** above are the nitty-gritty and those are where mistakes
are made by J-learners.

Finally, regarding the reason for the く-to-ぐ change in 「青ぐろい」, read
[here](https://en.wikipedia.org/wiki/Rendaku). The phenomenon is called
連濁{れんだく}.
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