univalve

Originated 1655–65 from uni- (“one”) +‎ valve.

univalve (not comparable)

1. having one valve, typically used to refer to mollusks, notably slugs and snails.
2. consisting of a single valve or piece, used to refer to a shell.

univalve (plural univalves)

1. A univalve mollusk or its shell.

The term univalve is now considered outdated in scientific classification, and the term gastropod is preferred.

• gastropod

• bivalve

• bivalve

• “univalve” in The American Heritage Dictionary of the English Language, 4th edition, Boston, Mass.: Houghton Mifflin, 2000, →ISBN.
• “univalve” in Dictionary.com Unabridged, Dictionary.com, LLC, 1995–present.
• "univalve" in WordNet 2.0, Princeton University, 2003.