groin

1 of 2

noun

ˈgrȯin 

1

: the fold or depression marking the juncture of the lower abdomen and the inner part of the thigh

also : the region of this line

2

a

: the projecting curved line along which two intersecting vaults meet

b

: a rib that covers this edge

3

: a rigid structure built out from a shore to protect the shore from erosion, to trap sand, or to direct a current for scouring a channel

Illustration of groin

• groin 2a

groin

2 of 2

verb

groined; groining; groins

transitive verb

: to build or equip with groins

Examples of groin in a Sentence

Recent Examples on the Web

Noun

The largest clusters sit at the neck and jaw, armpits, chest, abdomen, groin and behind the knees. — Allison Palmer, Charlotte Observer, 29 June 2026

Apply cold wet cloths to your neck, armpits and groin, where blood flow is highest, and keep sipping cool water. — Allison Palmer updated June 24, Fort Worth Star-Telegram, 24 June 2026

Light fingertip circles at the armpits and groin crease open the two largest drainage clusters in the body before movement begins. — Allison Palmer, Kansas City Star, 29 June 2026

Apply cold wet cloths to the neck, armpits and groin, the highest blood-flow areas, to accelerate cooling. — Allison Palmer updated June 25, Sacbee.com, 25 June 2026

Word History

Etymology

Noun

alteration of Middle English grynde, from Old English, abyss; akin to Old English grund ground

First Known Use

Noun

circa 1532, in the meaning defined at sense 1

Verb

circa 1816, in the meaning defined above

Rhymes for groin

• coin
• coyne
• join
• koine
• loin
• moine
• quoin
• adjoin
• benzoin
• bitcoin
• conjoin
• enjoin

Kids Definition

groin

1 of 2 noun

ˈgrȯin 

1

: the junction of the lower abdomen and the inner part of the thigh or the part of the body around this junction

2

: the curved line or rib on a ceiling along which two vaults meet

groin

2 of 2 verb

: to build or equip with groins

Medical Definition

groin

noun

ˈgrȯin 

: the fold or depression marking the juncture of the lower abdomen and the inner part of the thigh

also : the region of this line