endo-

Ancient Greek

AI-inferred

ἔνδον (éndon)

Within, inside; the source of the combining form endo-.

Scientific Latin/Greek combining form

Verified

endo-

Used in scientific compounds to mean inward or internal.

from French endocrine

krinein

Ancient Greek

AI-inferred

κρίνω (krínō)

To separate, distinguish; also to secrete or discharge.

Latinized scientific form

Verified

-crine

Combining form referring to secretion.

from French endocrine

Combined

French endocrine

French combined endo- with a Latinized form of Greek krínō.

French

Verified

endocrine

Term for something secreting internally.

from French endocrine

English

Verified

endocrine

Recorded from 1914, especially of glands whose secretions enter the bloodstream.

from French endocrine

Modern English

endocrine

Word Ancestry

endo-

Ancient Greek

AI-inferred

ἔνδον (éndon)

Within, inside; the source of the combining form endo-.

Scientific Latin/Greek combining form

Verified

endo-

Used in scientific compounds to mean inward or internal.

from French endocrine

krinein

Ancient Greek

AI-inferred

κρίνω (krínō)

To separate, distinguish; also to secrete or discharge.

Latinized scientific form

Verified

-crine

Combining form referring to secretion.

from French endocrine

Combined

French endocrine

French combined endo- with a Latinized form of Greek krínō.

French

Verified

endocrine

Term for something secreting internally.

from French endocrine

English

Verified

endocrine

Recorded from 1914, especially of glands whose secretions enter the bloodstream.

from French endocrine

Modern English

endocrine

“

Picture a gland as a tiny chemical post office: instead of pouring its message onto an exposed surface, it slips the letter straight into the bloodstream. That is the compact drama inside endocrine, built from Greek endon, “within,” and krínō, “to separate”—a verb that could also describe secreting something from a gland. The contrast became especially useful beside exocrine glands, which send their products outward through ducts, while endocrine glands release hormones into the body’s interior. English adopted the scientific term in 1914, just as physiology was mapping the body’s invisible messenger network; the modern meaning of hormone had itself been coined in 1905 by English physiologist Ernest Henry Starling. And here is the memorable twist: the Greek idea of “separating” lies behind words such as criterion and critical—so an endocrine gland is, etymologically, a little internal sorting-and-sending station.

The Story

“

Picture a gland as a tiny chemical post office: instead of pouring its message onto an exposed surface, it slips the letter straight into the bloodstream. That is the compact drama inside endocrine, built from Greek endon, “within,” and krínō, “to separate”—a verb that could also describe secreting something from a gland. The contrast became especially useful beside exocrine glands, which send their products outward through ducts, while endocrine glands release hormones into the body’s interior. English adopted the scientific term in 1914, just as physiology was mapping the body’s invisible messenger network; the modern meaning of hormone had itself been coined in 1905 by English physiologist Ernest Henry Starling. And here is the memorable twist: the Greek idea of “separating” lies behind words such as criterion and critical—so an endocrine gland is, etymologically, a little internal sorting-and-sending station.