any of the marine mollusks of the class Scaphopoda, which look similar to elephant tusks.

Any marine snail of the family Xenophoridae, which cements stones and shell fragments to its own shell.

(zoology) carrier shell (family Xenophoridae)

(zoology) Any member of the sea snail genus Vermetus.

(physics) The collective states of all electrons in an atom having the same principal quantum number (visualized as an orbit in which the electrons move).

Any of several large, thick, spiral marine shells belonging to Rapa and allied genera, somewhat turnip-shaped.

A marine gastropod of the family Turbinidae, or the shell thereof.

(malacology) A marine univalve shell of the genus Bulla and certain shells of similar appearance of the now disused order Tectibranchiata of molluscs.

Any species of the brachipod genus Lingula.

(business) A legal entity that demonstrably has no liabilities.