Etymograph

English

refractory

Refractory comes from Latin refractārius ‘obstinate’, from refrāctus ‘broken up or open’, and ultimately from Proto-Indo-European *bʰreg- ‘to break’.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*bʰreg-1‘to break’reconstructed
  2. Latinc. 75 BCE–200 CEfrangō2‘to break, shatter’
  3. Latinc. 75 BCE–200 CErefringō3as refringere, past participle‘to break up’
  4. Latinc. 75 BCE–200 CErefrāctus3‘broken up or open’
  5. Latinc. 75 BCE–200 CErefractārius3‘obstinate’
  6. Englishearliest quotation 1787refractory3

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Latin frango
  2. 2 Wiktionary, Latin refringo
  3. 3 Wiktionary, English refractory
  4. Earliest quotation in Wiktionary’s entry: 1787, Alexander Hamilton, No. 16: “[…] in most instances attempts to coerce the refractory…”.

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*bʰreg-Wiktionary, Latin frango‘to break’reconstructed
  2. Latinc. 75 BCE–200 CEfrangōWiktionary, Latin refringo‘to break, shatter’
  3. Latinc. 75 BCE–200 CErefringōWiktionary, English refractoryas refringere, past participle‘to break up’
  4. Latinc. 75 BCE–200 CErefrāctusWiktionary, English refractory‘broken up or open’
  5. Latinc. 75 BCE–200 CErefractāriusWiktionary, English refractory‘obstinate’
  6. Englishearliest quotation 1787refractoryWiktionary, English refractory. Earliest quotation in Wiktionary’s entry: 1787, Alexander Hamilton, No. 16: “[…] in most instances attempts to coerce the refractory…”

The story

Originally refractary, refractarie, but reanalysed after other adjectives in -ory.

Full etymology on Wiktionary

Linked words

through Proto-Indo-European *bʰreg- ‘to break’

break, broken, broke, brigade, brake, bracket, fraction, bray, suffrage, frail, breech, brogan, brogue, 37 more

through Latin frangō ‘to break, shatter’

fragile, fragment, fracture, fret, infringe, diffraction, infraction, fractal, 18 more

Today it means

adj Obstinate and unruly; strongly opposed to something.

Sources

Sources: Wiktionary, “refractory”; the older steps come from the Wiktionary entries for Latin frango, Latin refringo. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.

Etymograph / Proto-Indo-European *bʰreg- / refractory

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