Here the audio says roh-suh but many people also say rohs. (Close to the sound in Norse but without the r. Or like UK source (sauce)).
Depending who you ask one or the other might sound a bit odd to them (well not sure actually if people that say roh-suh like in this audio think rohs sounds a but silly, but the other way around (some) people do)
It is rose-coloured = rooskleurig/rozekleurig.
Perhaps derived from rozerood. The reddish colour of rosed