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The Collaborative International Dictionary of English v.0.48 (gcide)

catwalk \catwalk\ n.
1. A narrow walkway projecting from a stage into the seating
area of a theater; it is used, e. g. by models displaying
clothes on it at a fashion show. Called also {runway}.
[WordNet 1.5 PJC]

2. A narrow walkway high in the air to allow workers access
to parts of a structure otherwise difficult to reach.
Catwalks are located, e.g. above a stage in a theater,
between parts of a building, along the side of a bridge,
on the outside of a railroad car, on the outside of a
large storage tank, etc.
[WordNet 1.5 PJC]