A1 noun Neutral #49 most common

kidney

/ˈkɪdni/

A kidney is one of the two organs in the body that filter waste from the blood to produce urine. They are bean-shaped and located in the middle of the back.

Examples

3 of 5
1

Drinking water is very important for your kidney health.

Drinking water is very important for your kidney health.

2

The patient is currently awaiting a kidney transplant.

The patient is currently awaiting a kidney transplant.

3

I've got a bit of a dull ache in my kidney area.

I've got a bit of a dull ache in my kidney area.

Word Family

Noun
kidney
Adjective
renal
Related
nephrologist
💡

Memory Tip

Think of a 'kidney bean'—the vegetable is shaped exactly like the organ it is named after.

Quick Quiz

The doctor said my _____ are healthy because I drink enough water.

Correct!

The correct answer is: kidneys

Examples

1

Drinking water is very important for your kidney health.

everyday

Drinking water is very important for your kidney health.

2

The patient is currently awaiting a kidney transplant.

formal

The patient is currently awaiting a kidney transplant.

3

I've got a bit of a dull ache in my kidney area.

informal

I've got a bit of a dull ache in my kidney area.

4

The kidneys serve as a primary biological filter for toxins.

academic

The kidneys serve as a primary biological filter for toxins.

5

The hospital group is investing in new kidney dialysis equipment.

business

The hospital group is investing in new kidney dialysis equipment.

Word Family

Noun
kidney
Adjective
renal
Related
nephrologist

Common Collocations

kidney failure kidney failure
kidney stone kidney stone
kidney bean kidney bean
kidney transplant kidney transplant
kidney donor kidney donor

Common Phrases

kidney punch

a blow to the lower back

of the same kidney

of the same kind or nature

kidney-shaped

having the curved shape of a kidney

Often Confused With

kidney vs knee

A knee is a joint in your leg, while a kidney is an internal organ.

kidney vs kidney bean

A kidney bean is a type of vegetable, though it is named after the organ.

📝

Usage Notes

The word is most commonly used in a medical context or when discussing healthy habits. In the plural form 'kidneys', it refers to both organs.

⚠️

Common Mistakes

Learners sometimes confuse the pronunciation with 'knee' or forget that humans usually have two kidneys, so the plural is often needed.

💡

Memory Tip

Think of a 'kidney bean'—the vegetable is shaped exactly like the organ it is named after.

📖

Word Origin

From Middle English 'kidenere', possibly combining 'kid' (meaning womb or belly) and 'ey' (meaning egg, because of the shape).

Grammar Patterns

countable noun plural: kidneys often used as a noun adjunct (e.g., kidney health)
🌍

Cultural Context

In many cultures, 'steak and kidney pie' is a traditional British dish using the organ as an ingredient.

Quick Quiz

The doctor said my _____ are healthy because I drink enough water.

Correct!

The correct answer is: kidneys

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symptom

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