Capsule

(redirected from external capsule)
Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.
Related to external capsule: Extreme capsule

capsule

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
a. a dry fruit that liberates its seeds by splitting, as in the violet, or through pores, as in the poppy
b. the spore-producing organ of mosses and liverworts
4. Anatomy
a. a cartilaginous, fibrous, or membranous envelope surrounding any of certain organs or parts
b. a broad band of white fibres (internal capsule) near the thalamus in each cerebral hemisphere
5. an aeroplane cockpit that can be ejected in a flight emergency, complete with crew, instruments, etc.

Capsule

 

in biology:

  1. In animals and man, the membrane surrounding various organs and their parts (for example, the kidney, liver, or joint capsules) and also pathological formations (parasites that have implanted themselves in tissue, necrotic masses, foreign bodies). A capsule is composed primarily of fibrous connective tissue and sometimes of adipose cellular tissue.
  2. The gelatinous layer around a cell characteristic of the capsulated bacteria, formed from macromolecular substances produced by these microorganisms[11–1083^]

Capsule

 

(1) A dry dehiscent fruit with many seeds (sometimes with one seed), formed of two or several carpels. Capsules dehisce by means of a lid (plantain, henbane), tiny holes (poppy, bellflower), denticles on top of the capsule (primrose, pinks), or longitudinal splits (valves) along the septum (tobacco, hellebore) or along the valves (tulip, lily, hyacinth).

(2) The spore-bearing part of the sporangium of mosses. These capsules are either cylindrical or spherical.

capsule

[′kap·səl]
(aerospace engineering)
A small, sealed, pressurized cabin with an internal environment that will support human or animal life during extremely high-altitude flight, space flight, or escape.
(engineering)
A boxlike component or unit, often sealed.
(anatomy)
A membranous structure enclosing a body part or organ.
(botany)
A closed structure bearing seeds or spores; it is dehiscent at maturity.
(microbiology)
A thick, mucous envelope, composed of polypeptide or carbohydrate, surrounding certain microorganisms.
(pharmacology)
A soluble shell in which drugs are enclosed for oral administration.
References in periodicals archive ?
An MRI scan showed widespread white matter lesions, particularly prominent in the anterior temporal regions and external capsule.
The MRI scans showed involvement of the anterior temporal lobes and external capsule in all patients, as typically stated in other reports.
MRI hyperintensities of the temporal lobe and external capsule in patients with CADASIL.