amphibious

Etymology

It is borrowed from Latin amphibius (“living both on land and in water”) and directly borrowed from Ancient Greek ἀμφίβιος (amphíbios, “living a double life”), with the suffix -ous.^[2][3][4][5] The Shorter Oxford and the Oxford Dictionary of English derive it instead from New Latin amphibium.^[6][7] The Greek adjective is formed from ἀμφι- (amphi-, “both, on both sides”) and βίος (bíos, “life”),^[5][8][4][2] and was used of animals living both on land and in water, in Hellenistic Greek also of plants, and figuratively of the soul or the moon.^[2] Etymonline traces bíos to Proto-Indo-European *gwei- (“to live”).^[9]

Earliest recorded meaning

Having two distinct characters or modes of existence; of a double or ambiguous nature: 1608, in a sermon by Bishop J. King at Whitehall.^[2][10] Barnhart's first record is from 1643, in Sir Thomas Browne,^[4] and Etymonline dates the word to the 1640s.^[9]

Semantic evolution

From the start the word had the wide sense of combining two distinct or opposite qualities;^[8] Addison used it in a sense close to the modern unisex.^[8] This general sense has now almost given way to the zoological one.^[8] Of animals living both in water and on land it is recorded from 1616, and of plants from 1659;^[2] Johnson (1755) defined it as partaking of two natures, so as to live in air and water, quoting Hudibras.^[11] Naturalists at first applied it to any animal at home in both elements, such as seals, beavers or crocodiles,^[8][9] until it was restricted to the class Amphibia, around 1819 according to Ayto, in 1835 according to Etymonline.^[8][9] The sense "relating to both land and water" appears in 1646, in Browne's Pseudodoxia Epidemica;^[2] military operations by land and sea forces together are called amphibious from 1762,^[2] and vehicles that run on land and water from 1781, by Etymonline's dating from 1915.^[2][9]

Timeline

• 1608 – having a double or ambiguous nature.^[2][10]
• 1616 – of an animal, living both in water and on land.^[2]
• 1646 – relating to or suited for both land and water.^[2]
• 1659 – of a plant, able to grow in water and on land.^[2]
• 1762 – of military action, involving land and sea forces.^[2]
• 1781 – of a vehicle, able to travel on land and water.^[2]

Meanings

Adjective

1. Able to live both on land and in water, as frogs and newts do: Salamanders are amphibious creatures.^[12][10][2]
2. Of a military operation: launched from the sea against a shore by coordinated naval, land and air forces: an amphibious landing.^[12][10][2]
3. Of a vehicle or aircraft: able to travel or operate on both land and water.^[12][2]
4. Relating to, adapted for or made up of both land and water.^[10][2]
5. Having a double or mixed nature.^[12][2]

Word family

• amphibiously
• amphibiousness
• amtrac
• nonamphibious
• triphibious

Related words

• amphibian
• amphi-
• bio-
• biology
• amphitheatre

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k l m n o p q r s Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
4. ^ a b c Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
5. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
6. ^ Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
7. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
8. ^ a b c d e f Ayto, John (2005), Word Origins: The Secret Histories of English Words from A to Z, 2nd ed., London: A & C Black
9. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
10. ^ a b c d e Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
11. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
12. ^ a b c d Collins English Dictionary (2023), Glasgow: HarperCollins