Mask \Mask\, v. t. [imp. & p. p. Masked; p. pr. & vb. n. Masking.]

1. To cover, as the face, by way of concealment or defense against injury; to conceal with a mask or visor.

They must all be masked and vizarded. --Shak.

2. To disguise; to cover; to hide.

Masking the business from the common eye. --Shak.

3. (Mil.)
   (a) To conceal; also, to intervene in the line of.
   (b) To cover or keep in check; as, to mask a body of troops or a fortess by a superior force, while some hostile evolution is being carried out.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Masked \Masked\, a.

1. Wearing a mask or masks; characterized by masks; cincealed; hidden.

2. (Bot.) Same as Personate.

3. (Zo["o]l.) Having the anterior part of the head differing decidedly in color from the rest of the plumage; -- said of birds.

Masked ball, a ball in which the dancers wear masks.

Masked battery (Mil.), a battery so placed as not to be seen by an enemy until it opens fire. --H. L. Scott.

Masked crab (Zo["o]l.), a European crab (Corystes cassivelaunus) with markings on the carapace somewhat resembling a human face.

Masked pig (Zo["o]l.), a Japanese domestic hog (Sus pliciceps). Its face is deeply furrowed.

Source: Webster's Revised Unabridged Dictionary (1913)