Bilateria

The bilateria ə are the animals with bilateral symmetry, i.e. they have a front and a back end, as well as an upside and downside, and therefore a left and a right. In contrast, radially symmetrical animals like jellyfish have a topside and downside, but no front and back. The bilateria are a major group of animals, including the majority of phyl...
Found on http://en.wikipedia.org/wiki/Bilateria

Bilateria

(from the article `animal`) All animals except those in the four phyla mentioned above have bilaterally symmetrical ancestors and contain three body layers (triploblastic) with ...
Found on http://www.britannica.com/eb/a-z/b/64
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