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I located this excerpt from the 1837 Lewis Topographical Dictionary on another part of the IRO web site.
From Lewis' Topographical Dictionary of Ireland pub. 1837
DOLPHIN'S BARN, a village, partly in the parish of ST. JAMES, barony of NEWCASTLE, and partly in that of ST. CATHERINE, barony of UPPERCROSS, county of DUBLIN, and province of LEINSTER. This village, forming a suburb of the city of Dublin, consists chiefly of a long street on the road to Crumlin, partly situated between the circular road and the Grand Canal, which latter intersects the village, and is here crossed by a stone bridge. There are several tanyards, and the extensive dye-works of Messrs. Pims, who have also dye stuff mills at Rutland; and on the Crumlin road are the dyeing and finishing works of Mr. P. Nevin. There is a R. C. chapel in the village, also a convent of nuns of the Carmelite order, who have a school for the gratuitous instruction of about 100 poor female children, and a select school for 12 young ladies.
Castlemore Roscommon, IrelandXO Volunteer ☘
Dolphinsbarn is the name of a townland in that area. Townlands are used as addresses in rural Ireland, but have become somewhat irrelevant in larger towns and cities, where there are street addresses to use, except when doing genealogical searching. You can see more info about Dolphinsbarn at thiis link:
There's an interactive map at that site which shows where the townland lies within what is now greater Dublin. Adjoinig Dolphinsbarn is a separate townland called Dolphinsbarn North, and there is a link at the site listed above to more info about that neighboring townland.