noun-modifying (irregular)
whitish; tinged with white
Describes something that has a slight white tint or is somewhat white. Used prenominally.
壁は白みがかった色に塗られていた。
The wall was painted a whitish color.
白っぽい is a more common and colloquial way to say 'whitish', while 白みがかった is slightly more descriptive and literary.
From 白み (whiteness) + がかった (past form of がかる, 'to be tinged with').