Definition of "yaller"

"Forgot the yaller cuss!" replied he.

1861, Various, Atlantic Monthly, Volume 7, Issue 41, March, 1861‎

And it's lucky for the rest that they can't git it. I see three spears o ' yaller corn once tryin' to occoopy an acre lot. But they could n't seem to make no good use on't, an' growed yallerer an' yallerer, an' spindlin'er an' spindlin'er, till they didn't know themselves from pigeon grass.

1892, George Huntington, Nakoma: A Story of Frontier Life, page 172

And here's a orange, the biggest and yallerest I could pick out. And ther's sugar, and lemons, and fresh beef.

1906, Wayside Tales, page 41

See my yaller silk handkerchief, tew?

1909, Louise Forsslund, Old Lady Number 31‎

He met me single and he fought me clean, and he's going to be pulled down by no pack of yaller dogs!

1924, Max Brand, Bull Hunter‎