mollusc

Etymology

It is borrowed from French mollusque,^{[2][3][4][5][6]} from New Latin Mollusca, the name of a group of animals,^[2][3][4] which is the neuter plural of Latin molluscus (“thin-shelled; soft”),^[2][3][4][6] from mollis (“soft”).^[2][3][6][7] Collins and the Oxford Dictionary of English give the New Latin source without the French step,^[8][9] and Klein credits the French form to the naturalist Cuvier.^[10] The name Mollusca goes back to Jonston (1650), who used it for a group comprising the cephalopods, following Latin mollia in Pliny and Ancient Greek μαλάκια (malákia) in Aristotle.^[11] In classical Latin the adjective is found in nux mollusca, a thin-shelled nut with a soft interior.^[11][10][7] Etymonline and the American Heritage Dictionary derive that adjective from Proto-Indo-European *mel- (“soft”),^[3][2] while Ayto traces it to *mel-, *mol-, *ml-, "to grind".^[7] The American spelling is mollusk.^[8][6]

Earliest recorded meaning

An animal belonging to the group Mollusca: 1783, in the French spelling mollusque.^{[3][4][12][13]} Dictionary.com gives 1775–85.^[14]

Semantic evolution

Etymologically a mollusc is a soft creature;^[7] Word Origins explains the hard shell that most of them have by the softness of the body beneath it.^[15] Linnaeus adopted Mollusca in 1758 for an order of soft-bodied invertebrates, which at first included echinoderms and annelids and did not include animals with shells; later naturalists added those.^[4][3][6] In English, the Latin name is recorded from 1661 for a mixed group of mostly shell-less invertebrates,^[11] and Etymonline dates it to 1797.^[3] The modern scientific sense follows Cuvier's classification of the 1790s.^[3][4] The spelling mollusk is recorded from 1839.^[3][4]

Timeline

• 1661 – Mollusca, a mixed group of mostly shell-less invertebrates.^[11]
• 1783 – mollusque, an animal of this group.^{[3][4][12][13]}
• 1839 – the spelling mollusk.^[3][4]

Meanings

Noun

1. Any of the invertebrate animals of the phylum Mollusca, which have a soft unsegmented body and usually a hard shell, such as snails, mussels and octopuses, spelled mollusk in the US.^[8][6][13]

Word family

• molluscicide

Related words

• Mollusca
• molluscum
• mollify
• emollient
• melt
• mild

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
3. ^ a b c d e f g h i j k l Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ a b c d e f g h i Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
5. ^ Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
6. ^ a b c d e f Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
7. ^ a b c d Ayto, John (2005), Word Origins: The Secret Histories of English Words from A to Z, 2nd ed., London: A & C Black
8. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins
9. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
10. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
11. ^ a b c d Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
12. ^ a b Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press
13. ^ a b c Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
14. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
15. ^ Cresswell, Julia (2021), Oxford Dictionary of Word Origins, 3rd ed., Oxford: Oxford University Press