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coagulate

/koʊˈæɡ.jə.leɪt/

to thicken or cause a liquid to clot

From Latin co- (together) + Latin agō (to do).

verb
adjective
co-
Latin
AI-inferred
co-
together; jointly
Latin
AI-inferred
cōgō
I bring together, collect, or cause to curdle
agō
Latin
AI-inferred
agō
I do, make, drive, or set in motion
Latin
AI-inferred
cōāgulō
I cause to curdle, formed with co- and agō
-ulum
Latin
AI-inferred
-ulum
instrument-forming suffix
Latin
AI-inferred
coāgulum
a means of curdling; rennet
Combined
Latin coāgulātus
The past participle of coāgulō, meaning curdled or coagulated; English later built a verb from this form.
Old French
Verified
coaguler
to curdle or coagulate

from Old French coaguler and directly

Middle English
Verified
coagulaten
to clot blood or consolidate tissue

from Middle English coagulaten (“(of blood) to clot or, make blood coagulate; (of tissue) to consolidate”)

Modern English
Verified
coagulate
to become congealed or make something congeal

from Middle English coagulaten (“(of blood) to clot or, make blood coagulate; (of tissue) to consolidate”)

Modern English
coagulate

Picture a Roman cheesemaker watching warm milk surrender its smoothness and gather into curds. The Romans called the curdling agent a *coāgulum*, built from *co-*—“together”—and *agō*, “I drive” or “I bring about”; the image is not passive liquid but substance being driven into a new arrangement. Add the instrumental ending *-ulum*, and the word originally pointed toward a means of making things come together: rennet, the quiet chemical magician in the cheesemaker’s hand. Medieval French carried the verb across the Channel as *coaguler*, and English had *coagulaten* by the Middle English period. In modern medicine, the same old gathering metaphor describes platelets and fibrin assembling at a damaged blood vessel to stop bleeding. When blood coagulates, it is Latin’s “bring together” happening visibly inside the body: a liquid turns into a lifesaving patch.

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