2. (Zo["o]l.) A genus of echinoderms, including the common
edible sea urchin of Europe.
3. (Arch.)
(a) The rounded molding forming the bell of the capital of
the Grecian Doric style, which is of a peculiar
elastic curve. See {Entablature}.
(b) The quarter-round molding (ovolo) of the Roman Doric
style. See Illust. of {Column}
(c) A name sometimes given to the egg and anchor or egg
and dart molding, because that ornament is often
identified with Roman Doric capital. The name probably
alludes to the shape of the shell of the sea urchin.