embryo

Etymology

It is borrowed from Medieval Latin embryo, also embryon,^[2][3][4][5] from Ancient Greek ἔμβρυον (émbruon, “young animal, fetus”).^[2][4][6][7] The OED explains the Latin embryo as a reinterpretation of embryon after the Latin nouns in -iō,^[2] and the Shorter Oxford calls it a mistaken form arising from a misreading of the Greek noun's ending;^[8] English also had the form embryon from the 15th to the 18th century.^[2][6] The Greek noun is formed from ἐν (en, “in”) and βρύω (brúō, “to swell, be full”),^{[4][9][6][10][7]} so that it meant "that which grows inside";^[10][7] the OED instead derives the second part from βρύον (brúon, “moss”), literally "something that swells".^[2] Partridge compares Old Norse brum (“bud”) and a root Proto-Indo-European *bhreu- (“to swell”).^[11]

Earliest recorded meaning

An unborn human offspring, especially in its early stages: 1576, in G. Baker's translation of Gesner's Newe Jewell of Health.^[2] Merriam-Webster dates the word to 1548.^[3] Trevisa's translation of Bartholomaeus Anglicus (before 1398) already has embrio, which Barnhart takes as the first English record^[5] and the OED as the Latin word used in an English text.^[2] Etymonline dates the word to the mid-14th century.^[4]

Semantic evolution

From the unborn human child the word spread by 1638 to the unborn or unhatched young of an animal.^[2] A figurative use, a thing in its first, undeveloped form, appears in 1608, and the phrase in embryo, in a rudimentary stage, in 1631.^[2] Alchemists used it for a metal in a hidden or imperfect state in the earth (1652–1778),^[2] and botanists have used it since 1682 for the young plant inside a seed.^[2][8] As an adjective, undeveloped or immature, it is recorded from 1659.^[2] In modern medicine an embryo is the human offspring up to about the end of the second month of pregnancy, after which it is a fetus.^[12]

Timeline

• 1576 – the unborn human offspring.^[2] Merriam-Webster dates the word to 1548.^[3]
• 1608 – figurative, a thing in a rudimentary form.^[2]
• 1631 – in embryo, in a rudimentary stage.^[2]
• 1638 – the unborn or unhatched young of an animal.^[2]
• 1659 – adjective, undeveloped, immature.^[2]
• 1682 – the young plant within a seed.^[2]
• 1831 – verb, to create in embryonic form (rare).^[2]

Meanings

Noun

1. An animal in the early stages of development, before birth or hatching.^[12][3][2]
2. A human offspring from conception to about the end of the second month of pregnancy; compare fetus.^[12]
3. The young plant inside a seed.^[12][2]
4. Something in its earliest, undeveloped stage.^[2][8]
5. in embryo: not yet fully formed: The plan was still in embryo.^[2][8]

Word family

• embryectomy
• embryogenesis
• embryoid
• embryology
• embryonal
• embryonic
• embryopathy
• embryotomy

Related words

• bryophyte

References

1. ^ a b 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 t u v w Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
4. ^ a b c d Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
5. ^ a b Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
6. ^ a b c Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
7. ^ a b c Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
8. ^ a b c d Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
9. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
10. ^ a b Ayto, John (2005), Word Origins: The Secret Histories of English Words from A to Z, 2nd ed., London: A & C Black
11. ^ Partridge, Eric (1966), Origins: A Short Etymological Dictionary of Modern English, 4th ed., London: Routledge & Kegan Paul
12. ^ a b c d Collins English Dictionary (2023), Glasgow: HarperCollins