plume

American  

[ploom] / plum /

noun

1. a feather.

2. a large, long, or conspicuous feather.

   the brilliant plume of a peacock.

3. a soft, fluffy feather.

   the plume of an egret.

4. any plumose part or formation.

5. a feather, a tuft of feathers, or some substitute, worn as an ornament, as on a hat, helmet, etc.

6. a feather or featherlike token of honor or distinction, especially one worn on a helmet.

7. plumage.

8. a vertically or longitudinally moving, rising, or expanding fluid body, as of smoke or water.

9. a visible pattern of smoke resulting from emissions from a stack, flue, or chimney.

10. Also called mantle plume.  Geology. a deep-seated upwelling of magma within the earth's mantle.

---

verb (used with object)

plumed, pluming

1. to furnish, cover, or adorn with plumes or feathers.

2. (of a bird) to preen (itself or its feathers).

3. to feel complacent satisfaction with (oneself ); pride (oneself ) (often followed by on orupon ).

   She sat before the mirror, pluming herself upon her beauty.

plume British  

/ pluːm /

noun

1. a feather, esp one that is large or ornamental

2. a feather or cluster of feathers worn esp formerly as a badge or ornament in a headband, hat, etc

3. biology any feathery part, such as the structure on certain fruits and seeds that aids dispersal by wind

4. something that resembles a plume

   a plume of smoke

5. a token or decoration of honour; prize

6. Also called: mantle plume.  geology a rising column of hot, low viscosity material within the earth's mantle, which is believed to be responsible for linear oceanic island chains and flood basalts

---

verb

1. to adorn or decorate with feathers or plumes

2. (of a bird) to clean or preen (itself or its feathers)

3. to pride or congratulate (oneself)

plume Scientific  

/ plo̅o̅m /

1. A feather, especially a large one.

2. A body of magma that rises from the Earth's mantle into the crust.

3. ◆ If a plume rises to the Earth's surface, it erupts as lava.

4. ◆ If it remains below the Earth's surface, it eventually solidifies into a body of rock known as a pluton.

5. An area in air, water, soil, or rock containing pollutants released from a single source. A plume often spreads in the environment due to the action of wind, currents, or gravity.

---

Other Word Forms

• plumeless adjective
• plumelike adjective
• replume verb (used with object)

Etymology

Origin of plume

1350–1400; earlier plome, plume, Middle English plume < Middle French < Latin plūma soft feather (> Old English plūm-, in plūmfether downy feather)

Example Sentences

It was the plume poppies in Michael Pollan’s garden that seeded his new book.

From Los Angeles Times • Feb. 24, 2026

Known as a mantle plume, this steady column of molten rock originates far below the surface.

From Science Daily • Feb. 23, 2026

Now scientists are directly linking the uncontrolled rocket re-entry to a plume of lithium measured less than 100km above Earth.

From BBC • Feb. 19, 2026

The team then traced the plume back to where the rocket re-entered the atmosphere, west of Ireland.

From Barron's • Feb. 19, 2026

I fell out of the doorway just as a plume of fire surged after me.

From "The Many Assassinations of Samir, the Seller of Dreams" by Daniel Nayeri