From moor + -ish.
moorish (comparative more moorish, superlative most moorish)
- (now rare) Boggy, marshy; like a moor.
- 1621, Robert Burton, The Anatomy of Melancholy, I.iii.3:
- glow-worms, fire-drakes, meteors, ignis fatuus [...], with many such that appear in moorish grounds, about churchyards, moist valleys, or where battles have been fought [...].