1. Wearing a mask or masks; characterised by masks; cincealed; hidden.
2. (Science: botany) same as personate.
3. (Science: ornithology) Having the anterior part of the head differing decidedly in colour from the rest of the plumage; said of birds. Masked ball, a ball in which the dancers wear masks. Masked battery, a battery so placed as not to be seen by an enemy until it opens fire.
4. (Science: zoology) masked crab, a Japanese domestic hog (Sus pliciceps). Its face is deeply furrowed.