capsule

American  

[kap-suhl, -sool, -syool] / ˈkæp səl, -sul, -sjul /

noun

• capsules
  plural

1. Pharmacology. a gelatinous case enclosing a dose of medicine.

2. Biology.

   1. a membranous sac or integument.

   2. either of two strata of white matter in the cerebrum.

   3. the sporangium of various spore-producing organisms, such as ferns, mosses, algae, and fungi.

3. Botany. a dry dehiscent fruit, composed of two or more carpels.

4. a small case, envelope, or covering.

5. Also called space capsule. Aerospace. a sealed cabin, container, or vehicle in which a person or animal can ride in flight in space or at very high altitudes within the earth's atmosphere.

6. Aviation. a similar cabin in a military aircraft, which can be ejected from the aircraft in an emergency.

7. a thin metal covering for the mouth of a corked bottle.

8. a concise report; brief outline.

   An appendix to the book contains biographical capsules of the contributors.

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verb (used with object)

capsuled, capsuling

1. to furnish with or enclose in or as if in a capsule; encapsulate.

2. to capsulize.

adjective

1. small and compact.

2. short and concise; brief and summarized.

   a capsule report.

3. containing only the most essential and versatile items of a particular kind.

   capsule wardrobe;

   capsule pantry.

capsule British  

/ ˈkæpsjuːl /

noun

1. a soluble case of gelatine enclosing a dose of medicine

2. a thin metal cap, seal, or cover, such as the foil covering the cork of a wine bottle

3. botany

   1. a dry fruit that liberates its seeds by splitting, as in the violet, or through pores, as in the poppy

   2. the spore-producing organ of mosses and liverworts

4. bacteriol a gelatinous layer of polysaccharide or protein surrounding the cell wall of some bacteria: thought to be responsible for the virulence in pathogens

5. anatomy

   1. a cartilaginous, fibrous, or membranous envelope surrounding any of certain organs or parts

   2. a broad band of white fibres ( internal capsule ) near the thalamus in each cerebral hemisphere

6. See space capsule

7. an aeroplane cockpit that can be ejected in a flight emergency, complete with crew, instruments, etc

8. (modifier) in a highly concise form

   a capsule summary

9. (modifier) (in the fashion industry) consisting of a few important representative items

   a capsule collection

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capsule Scientific  

/ kăp′səl,-so̅o̅l /

1. A dry dehiscent fruit that develops from two or more carpels, as in the poppy and the cottonwood tree.

2. The sporangium (the hollow spore-producing structure) of mosses and other bryophytes.

3. The outer layer of viscous polysaccharide or polypeptide slime with which some bacteria cover their cell walls. Capsules provide defense against phagocytes and prevent the bacteria from drying out.

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Other Word Forms

Derived Forms

• uncapsuled
  adjective

Inflected Forms

Nouns

• capsules
  plural

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Etymology

Origin of capsule

First recorded in 1645–55; 1950–55 capsule for def. 5; from French or directly from Latin capsula, equivalent to caps(a) “box” + -ula diminutive suffix; see origin at case ², -ule

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Explanation

A capsule is a very small container that closes tightly. Many medicines come in capsules that can be easily swallowed. Certain brands of laundry or dishwasher soap can be bought in capsule form, and you might hide a secret note or special mementos in a time capsule. A biologist probably thinks of a capsule as an anatomical structure that encloses an organ. This, in fact, is the word's earliest meaning — in French, it's a "membranous sac," from the Latin capsula, "small box or chest."

Example Sentences

See Examples For:

capsule capsules capsuled capsuling

"The shipwreck is a time capsule at the bottom of the sea," said Prof Hakan Öniz, from Akdeniz University in Turkey, who led the Mediterranean Archaeology Association expedition.

From BBC ● Oct. 14, 2026

The Artemis II astronauts who flew around the moon earlier this year are back in Florida, reunited with their capsule and launch team.

From Los Angeles Times ● Oct. 8, 2026

"And in 10 years' time, the first European manned capsule take off from Kourou with European astronauts and those from other nations on board," he added, referring to Europe's spaceport in French Guiana.

From Barron's ● Sep. 10, 2026

The collapsing capsule compresses fusion fuel to the extraordinary pressures and temperatures required for fusion reactions.

From Science Daily ● Aug. 20, 2026

To retrieve the astronaut safely, we had to make sure that we understood the exact place and time that space capsule would touch down.

From "Reaching for the Moon" by Katherine Johnson

Until now, all Starship flights have been suborbital, meaning the capsules were high enough to reach space, but did not travel fast enough or long enough to complete a loop around the Earth.

From BBC ● Sep. 28, 2026

Europe has in recent years sought greater independence in space but has never sent a manned mission, instead relying on the rockets and capsules of Russia and the United States.

From Barron's ● Sep. 10, 2026

This exceptionally hard form of carbon is used to make the tiny capsules that hold fuel in inertial confinement fusion experiments.

From Science Daily ● Aug. 20, 2026

Complete coverage of The Times’ All-Star baseball and softball teams, from the players and coaches of the year to capsules on each player and the final 2026 rankings.

From Los Angeles Times ● Jun. 7, 2026

It is also interesting to watch the capsules on either side of yours.

From "The London Eye Mystery" by Siobhan Dowd

The contrast capsuled the revolution in the mode of protest in the U.S. that has taken place in the '60s.

From Time Magazine Archive

Indeed, the history of the U.S. can plausibly be capsuled in a litany of slogans: No taxation without representation.

From Time Magazine Archive

Motor Chassis Manufacturer" and builds no bodies whatever, seemed the philosophy of U. S. automotive engineers as capsuled by President Stout: "The car must look right above all things.

From Time Magazine Archive

Few Englishmen would think of scrutinizing them, but scrutinized they turn out to be almost a capsuled paraphrase of the Silver Jubilee reign.

From Time Magazine Archive

The reasons why are neatly capsuled in Shirley's cinefantasy with Mitchum, described as "one of those Hollywood movies all about love and what'11-she-wear-next?"

From Time Magazine Archive

Freedom," he said, capsuling his own political philosophy, "has been defined as the opportunity for selfdiscipline.

From Time Magazine Archive

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Related Words

• dose
• pellet
• pill

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