The termination ACO in the first two of these expressions is clearly the Ar.
"The Arawack Language of Guiana in its Linguistic and Ethnological Relations"
Daniel G. Brinton
You would haf stapt her long ACO, my lort, if she'll was your wife, and you was knowing the tamned fox and padger she was pe.
"Malcolm"
George MacDonald
In the immediate foreground-at his feet, indeed-there was the river, the narrow ACO, peACOck-green, a dark file of poplars on either bank, rushing pell-mell away from the quiet waters of the lake.
"The Cardinal's Snuff-Box"
Henry Harland