English Reference

Word

hormone

Phoneticshor·mone

US/ˈhɔɹˌmoʊn/

UK/hˈɔːməʊn/

Definitions

01biological messenger

B2 · Science

n. a natural chemical in your body that tells your organs how to work.

n. a regulatory substance produced in an organism and transported in tissue fluids such as blood or sap to stimulate specific cells or tissues into action.

“Insulin is a hormone that helps your body control the amount of sugar in your blood.”

“The endocrine system releases hormones directly into the bloodstream, where they travel to target receptors to regulate metabolic processes and maintain homeostasis.”

Usage

Usually a countable noun when referring to specific types like insulin or adrenaline.

Synonyms

chemical messenger

02synthetic medication

B2 · Medicine

n. a man-made version of a natural hormone used as medicine.

n. a synthetic compound or pharmaceutical product designed to mimic the physiological effects of a natural hormone.

“The doctor prescribed a hormone cream to help with her skin condition.”

“Patients undergoing certain treatments may require synthetic hormones to compensate for glandular deficiencies or to suppress specific physiological responses.”

Synonyms

synthetic hormone

03plant growth substance

C1 · Science

n. a chemical in plants that helps them grow or flower.

n. any of various organic compounds, such as auxin or gibberellin, that regulate plant growth and development.

“Farmers use a special hormone to make the fruit ripen at the same time.”

“Plant hormones, or phytohormones, coordinate growth and responses to environmental stimuli by regulating gene expression and cell division.”

Technical

Synonyms

phytohormone

04to treat with chemicals

C2

v. to give hormones to an animal or plant to make it grow faster.

v. to treat or inject an organism with hormones, often for agricultural or experimental purposes.

“Some people worry about eating meat from cows that have been hormoned.”

“The livestock were hormoned to accelerate muscle development, a practice that remains controversial in several international markets.”

Informal · Technical

Usage

This transitive verb use is relatively rare and often carries a negative connotation in consumer contexts.

Real-World Examples

“Despite this known link between female sex hormones and histamine, it doesn’t prove that perimenopausal symptoms – as opposed to allergy symptoms – are related to histamine.”
The Guardian · 14 Aug 2026
“On average, the women who received hormone therapy began using it after age 70.”
ScienceDaily · 14 Aug 2026

Etymology

Learned borrowing from Ancient Greek ὁρμῶν (hormôn), present participle of ὁρμάω (hormáō, “to set in motion, to urge on”), from ὁρμή (hormḗ, “rapid motion forwards, onrush, onset, assault, impulse to do a thing, effort”).

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

Collocations

hormones called

Word family

hormonalAdjectivehormoneNoun

Domains

BotanyPharmacology

This entry

Level
B2 · Upper Intermediate
Frequency
Frequent
Updated

Scan code

englishreference.com/q/hormone

English Reference