about colors and grammar

[dilermando]

I was searching for the color's names and I have a question. Consider the following colors from Tabela de cores - Wikipédia, a enciclopédia livre

palegreen and forestgreen.

There's a trouble here, because I don't find these words in any dictionary.

What's wrong here?

By the way, is "in" the correct preposition that I should use when I am searching words "in" dictionary?

Two more question. Which is one correct (of course, if there's anyone correct).

I search words "in" dictionary (I mean to know the definition).
I seek words "in" dictionary (I mean to know the definition).
I look for words "in" dictionary (I mean to know the definition).

Is there a better way to ask a question like that in English?

[Raymott]

I was searching for the color's names and I have a question. Consider the following colors from Tabela de cores - Wikipédia, a enciclopédia livre

palegreen and forestgreen.

There's a trouble here, because I don't find these words in any dictionary.

What's wrong here?

By the way, is "in" the correct preposition that I should use when I am searching words "in" dictionary?

Two more question. Which is one correct (of course, if there's anyone correct).

I search words "in" dictionary (I mean to know the definition).
I seek words "in" dictionary (I mean to know the definition).
I look for words "in" dictionary (I mean to know the definition).

Is there a better way to ask a question like that in English?

What's wrong here?
What's wrong is that whoever compiled the table conflated all the colour terms such as "dark slate grey" to one word "darkslategrey".
Yes. "in the dictionary".
"I look for words in the dictionary".
"I search for words in the dictionary"
"Which one is correct (if any)". "Which one, if any, is correct"?