Etymology

pennon

pen·non
P3E1N1N1O1N1

Today it means: A long, narrow flag or streamer, often swallowtailed or triangular, usually hung at the top of a helmet or lance, originally the ensign of a knight under the rank of knight banneret, and later of a lancer regiment. Full definition →

Middle English pennon ← Anglo-Norman penun ← Middle French pennon
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The story

  1. Proto-Indo-European · derived from*peth₂-“to spread out; to fly (in the sense of spreading out wings)”
  2. Latin · derived frompenna“feather (especially a flight feather), pinion; wing”
  3. Old French · derived frompenon“flag attached to a lance”
  4. Middle French · derived frompennon
  5. Anglo-Norman · derived frompenun“feather of an arrow”
  6. Middle English · inherited frompennon
  7. English todaypennon

From Late Middle English pennon, penoun (“long narrow flag attached to a lance or used in other contexts; one who bears a pennon, knight bachelor; plume of feathers; strip around the edge of a shield”), from Anglo-Norman penun (“feather of an arrow”), penoun (“flag attached to a lance”), Middle French pennon, penoun, and Old French penon (“flag attached to a lance”) (modern French pennon), from penne (“feather; wing”) + -on (diminutive suffix). Penne is inherited from Latin penna (“feather (especially a flight feather), pinion; wing”), ultimately from Proto-Indo-European *peth₂- (“to spread out; to fly (in the sense of spreading out wings)”).

Words from the same roots

Old Frenchpenon all →

Latinpenna all →

penpennantpinionpennapennaceouspennagepennalpennibrachium

Proto-Indo-European*peth₂- all →

passpatentpetalperpetuatepatinapasserineletters patentpetalum

Etymology from Wiktionary, CC BY-SA 4.0.