biology
: an animal having bilateral symmetry
Scientists refer to animals, including humans, with this two-sided symmetry as bilaterians.—
Carl Zimmer, New York Times, 21 June 2005 Comb jellies and cnidarians branched off before bilaterians diversified into the variety of animal groups known today, and they are considered relatively "simple" organisms.—Elizabeth Pennisi, Science, 6 July 2007
bilaterian
adjective
… it is possible that bilaterian life emerged early in the Ediacaran, but at present, no fossils or trace fossils from this time have been reported.
—Ernesto Pecoits et al., Science, 29 June 2012
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Merriam-Webster unabridged
Copy Citation
Share