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You look up a word in a dictionary ( http://dictionary.com ) then put the definition here for people to guess what word it is.

1. a structure spanning and providing passage over a river, chasm, road, or the like.

A dog?

1. a natural elevation of the earth's surface rising more or less abruptly to a summit, and attaining an altitude greater than that of a hill, usually greater than 2000 ft. (610 m).

A mountain

1.A small voracious fish.