Definify.com
Webster 1913 Edition
Turban-shell
Tur′ban-shellˊ
,Noun.
(Zool.)
A sea urchin when deprived of its spines; – popularly so called from a fancied resemblance to a turban.
Webster 1828 Edition
Turban-shell
TUR'BAN-SHELL
,Noun.