co-star

from WordNet (r) 3.0 (2006)

co-star
    n 1: one of two actors who are given equal status as stars in a
         play or film
    v 1: feature as the co-star in a performance
    2: be the co-star in a performance

from The Collaborative International Dictionary of English v.0.48

co-star \co-star\ v. t.
   to feature as the co-star in a performance; as, the film
   co-starred Robin Williams as the psychiatrist.
   [WordNet 1.5]

from The Collaborative International Dictionary of English v.0.48

co-star \co-star\ v. i.
   to be the co-star in a performance; as, Robin Williams
   co-starred in the film.
   [WordNet 1.5]

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