What does corpuscle mean?
A corpuscle is a minute body or small discrete particle, a term most familiar today from biology, where it denotes a red or white blood cell — the tiny disc-shaped carriers of oxygen and the immune defenders that circulate in the bloodstream. The word entered English in the mid-seventeenth century, derived from Latin 'corpus' (body) via its diminutive form, and was long used for any small granular structure visible under a microscope. In the late nineteenth century the physicist J.J. Thomson borrowed the term for the negatively charged particles he had discovered in cathode rays, before those particles were renamed electrons. Although largely superseded by more precise vocabulary, 'corpuscle' persists in medical writing, histology, and the history of science, lending texts a slightly classical, technical flavour. Its plural is 'corpuscles', and related terms include the adjective-like forms used in phrases such as 'red blood corpuscle'.
nounA corpuscle is a small particle or minute body, especially a red or white blood cell; in physics it historically referred to a tiny discrete particle such as the electron.
- A small body or cell, especially a red or white blood cell.
- A minute particle, especially in older physics usage (e.g. Thomson's 'corpuscle' for the electron).
"Under the microscope, each crimson corpuscle drifted past like a tiny disc."
"The pathologist counted the white corpuscles to check for signs of infection."
"Thomson's discovery of the corpuscle — later renamed the electron — revolutionized atomic theory."
Standard regular plural; used freely with both the biological and historical physics senses.
"Her blood smear showed unusually large numbers of white corpuscles."
Before scientists settled on calling electrons 'electrons', J.J. Thomson proposed naming them 'corpuscles' — making this humble word briefly a contender for describing the fundamental building block of matter.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of corpuscle
Corpuscle comes from Latin 'corpusculum', the diminutive of 'corpus' meaning 'body', literally 'a little body'. It entered English around the mid-seventeenth century, when natural philosophers used it for minute physical particles. The same Latin root gives English words such as 'corporeal', 'corporation', and 'corsage'-related 'corpse', all carrying the sense of 'body'.
How corpuscle is actually used
'Corpuscle' is now largely confined to scientific and historical contexts. In medicine it sounds slightly old-fashioned compared with 'red blood cell' or 'white blood cell', though it remains standard in some textbooks and exam terminology. In physics it is chiefly of historical interest.
Easily confused with corpuscle
In modern usage, 'particle' is the general physics term for a minute piece of matter, while 'corpuscle' survives mainly as a biological term for blood cells and as an archaic physics label.