germ

noun

ˈjərm 

plural germs

1

a

: a small mass of living substance capable of developing into an organism or one of its parts

b

: the embryo with the scutellum of a cereal grain that is usually separated from the starchy endosperm during milling

2

: something that initiates development or serves as an origin : rudiments, beginning

3

: a microorganism causing disease : a pathogenic agent (such as a bacterium or virus)

broadly : microorganism

Synonyms of germ

• origin
• root
• seed
• beginning

Examples of germ in a Sentence

the germ that causes tuberculosis

the germ of an idea

the germ layers of an embryo

Recent Examples on the Web

She was diagnosed with retinitis pigmentosa — an eye disease that causes vision loss — and lupus, a disease where the immune system mistakenly attacks the body’s healthy tissues and organs instead of fighting germs, according to court records. —Chase Jordan april 10, Charlotte Observer, 10 Apr. 2026

Door Handles, Light Switches and Remote Controls These high-touch surfaces collect germs daily but are rarely disinfected. —Lauren Jarvis-Gibson, Kansas City Star, 9 Apr. 2026

Medium includes some of the bran and germ, translating to a bit more flavor and nutrition. —The Washington Post, San Diego Union-Tribune, 8 Apr. 2026

How Zinc and Echinacea Affect Your Immune System The mineral zinc is involved in both the body's general immune responses (the innate immune system) and the specialized defenses the body develops after exposure to specific germs (the adaptive immune system). —Megan Nunn, Verywell Health, 8 Apr. 2026

Word History

Etymology

French germe, from Latin germin-, germen, from gignere to beget — more at kin

First Known Use

circa 1550, in the meaning defined at sense 2

Phrases Containing germ

• germ cell
• germ-free
• germ layer
• germ line
• germ plasm
• germ theory
• germ warfare
• wheat germ

Rhymes for germ

• berm
• ferm
• firm
• herm
• sperm
• squirm
• term
• therm
• worm
• wurm
• affirm
• bookworm

Kids Definition

germ

noun

ˈjərm 

1

a

: a small mass of living substance capable of developing into a whole individual or one of its parts

b

: the embryo in the seed of a cereal (as corn or wheat) together with its cotyledon that is usually separated from the starchy part of the seed during milling

2

: something that serves as an origin

the germ of an idea

3

: a microscopic living thing

especially : one that causes disease

Medical Definition

germ

noun

ˈjərm 

1

: a small mass of living substance capable of developing into an organism or one of its parts

2

: a microorganism causing disease : a pathogenic agent (as a bacterium or virus)

broadly : microorganism