The Collaborative International Dictionary
Conchyliaceous
Conchylaceous \Con`chy*la"ceous\, Conchyliaceous
\Con*chyl`i*a"ceous\, a. [L. conchylium shell, Gr. ?, dim. of ?,
equiv. to ?. See Conch.]
Of or pertaining to shells; resembling a shell; as,
conchyliaceous impressions.
--Kirwan.
Wiktionary
conchyliaceous
a. (alternative form of conchylaceous English)