the respiratory organ of fish and other aquatic animals, used to extract dissolved oxygen from water and excrete carbon dioxide, a slit on the body of an insect for breathing

Formal and Informal Expressions of gills

In different contexts, you can replace 'gills' with suitable alternatives. In a more formal setting, 'respiratory organ' is apt. In informal speech or writing, 'breathing thing' is a commonplace synonym.

gills: Explore its Definition & Usage

gills Definition

1the respiratory organ of fish and other aquatic animals, used to extract dissolved oxygen from water and excrete carbon dioxide
2a slit on the body of an insect for breathing

Using gills: Examples

Take a moment to familiarize yourself with how "gills" can be used in various situations through the following examples!

Example
Fish use their gills to breathe underwater.
Example
The insect's gills are located on its abdomen.

gills Synonyms and Antonyms

Synonyms for gills

respiratory organ
breathing apparatus

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Summary: gills in Brief

The term 'gills' [ɡɪlz] refers to the respiratory organs of fish and other aquatic animals, which extract dissolved oxygen from water and excrete carbon dioxide. Insects also have gills, which are slits on their bodies for breathing.