English Reference

Word

embolism

Phoneticsem·bolism

US/ˈɛmboʊˌɫɪzəm/

UK/ˈɛmbəʊlˌɪzəm/

Definitions

01medical blockage

C1 · Medicine

n. a blockage in a blood vessel caused by a clot, air bubble, or other material that has moved through the blood.

n. the sudden obstruction of a blood vessel by an embolus that has been transported via the circulatory system from another part of the body.

“The patient suffered a pulmonary embolism after a long flight without moving.”

“A pulmonary embolism occurs when a blood clot, typically originating in the deep veins of the legs, dislodges and travels to the lungs.”

Technical

Usage

Often used with a qualifying adjective to specify the location, such as 'pulmonary' or 'cerebral'.

Teaching tip

This is the primary sense used in modern English; other senses are highly specialized and rare.

02calendar adjustment

C2

n. adding extra days to a calendar to make it match the solar year.

n. the intercalation of days or months into a calendar to align the civil year with the solar or lunar year.

“The ancient calendar required a regular embolism to keep the seasons aligned.”

“The Metonic cycle uses a specific pattern of embolism to reconcile the differences between lunar months and the solar year.”

Technical · Archaic

Usage

Usually uncountable in this sense.

Teaching tip

This sense is largely restricted to historical or astronomical contexts; 'intercalation' is more common in modern academic writing.

Synonyms

intercalationinsertion

03liturgical prayer

C2 · Religion

n. a short prayer added after the Lord's Prayer in some church services.

n. a short prayer for deliverance from evil that follows the Lord's Prayer in certain Christian liturgies.

“The priest recited the embolism before the congregation offered the sign of peace.”

“In the Roman Rite, the embolism expands upon the final petition of the Pater Noster, focusing on the plea for peace and freedom from sin.”

Technical · Formal

Teaching tip

This is a highly specific term used in liturgical studies and theology.

Synonyms

intercalationaddition

Real-World Examples

“As a plant dries, gas bubble blockages, or embolisms, can form in the plant's water-transporting tissues.”
Phys.org · 17 Aug 2026

Etymology

The term was coined in 1848 by Rudolf Virchow. From Old French embolisme (“intercalation of days in a calendar to correct errors”), from Late Latin embolismus, from Ancient Greek ἐμβολισμός (embolismós, “intercalary”), from ἐμβάλλω (embállō, “to insert, throw in”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry

Level
C1 · Advanced
Frequency
Occasional
Updated

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English Reference