Etymograph

English

rostrulum

Rostrulum comes from Latin rostrum ‘bill or beak of a bird’, from rōdō ‘to gnaw’, and ultimately from Proto-Indo-European *Hreh₃d-.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*Hreh₃d-1‘to scrape, scratch, gnaw’reconstructed
  2. Latinc. 75 BCE–200 CErōdō1‘to gnaw’
  3. Latinc. 75 BCE–200 CErostrum2‘bill or beak of a bird’
  4. Englishtodayrostrulum2

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Latin rostrum
  2. 2 Wiktionary, English rostrulum

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*Hreh₃d-Wiktionary, Latin rostrum‘to scrape, scratch, gnaw’reconstructed
  2. Latinc. 75 BCE–200 CErōdōWiktionary, Latin rostrum‘to gnaw’
  3. Latinc. 75 BCE–200 CErostrumWiktionary, English rostrulum‘bill or beak of a bird’
  4. EnglishtodayrostrulumWiktionary, English rostrulum

Linked words

through Proto-Indo-European *Hreh₃d- ‘to scrape, scratch, gnaw’

root, rat, rout, 7 more

through Latin rōdō ‘to gnaw’

erosion, corrosion, rodent, erode, corrode, 6 more

Today it means

noun A little rostrum (beak-like projection of an insect).

Sources

Sources: Wiktionary, “rostrulum”; the older steps come from the Wiktionary entry for Latin rostrum. 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 *Hreh₃d- / rostrulum

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