Sentence:  The play is indeed dominated by disguise and linguistic mimicry as Titus, the "carrot-headed" comic hero, tries to overcome prejudice against redheads and climb the social ladder by donning a wig and pretending to be "normal" in matters <WSD>pileous</WSD>. 
Meaning of the word marked with <WSD> tags:  Of, pertaining to, or consisting of hair.