the GNU version of the Collaborative International Dictionary of English
n. A genus of small pectinibranch mollusks, having thick spiral shells, abundant between tides on nearly all rocky seacoasts. They feed on seaweeds. The common periwinkle is a well-known example. See periwinkle.
The Century Dictionary and Cyclopedia
n. The typical genus of Littorinidæ.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. type genus of the family Littorinidae: periwinkles
Word Usage
"I sent them in search of the shell, and they returned bringing me some living specimens of different shells, chiefly _littorina_ and _cerithium."