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Coma (Noun)

A state of deep and often prolonged unconsciousness; usually the result of disease or injury.

Nouns denoting cognitive processes and contents.

The patient fell into a coma after the accident and has been in the hospital for several weeks.
He was left in a coma after suffering a brain injury during the football game.
She slipped into a coma due to the medication overdose and didn't regain consciousness for days.
The doctor explained that the coma was caused by a lack of oxygen to the brain during the surgery.
After months in a coma, he finally showed signs of waking up, bringing hope to his family.

(botany) a usually terminal tuft of bracts (as in the pineapple) or tuft of hairs (especially on certain seeds).

Nouns denoting plants.

The pineapple's tough, waxy leaves formed a protective coma around the fruit as it ripened.
The coma of silky hairs on the dandelion seed helped it disperse in the wind.
The coma of bracts on the pineapple plant served as a crown, protecting the delicate fruit beneath.
The seed's coma was so fluffy that it looked like a tiny, cottony ball.
The coma of hairs on the cottonwood seed gave it a distinctive, feathery appearance.

(astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed.

Nouns denoting natural objects (not man-made).

As Halley's Comet approached the Sun, a bright coma formed around its icy nucleus, visible to astronomers on Earth.
The coma of a comet can range in size from a few thousand to hundreds of thousands of kilometers across.
A comet's coma is composed of gas and dust that vaporize as the comet approaches the Sun's heat.
The coma of Comet Hale-Bopp was particularly large and active as it passed close to the Sun in 1997.
Astronomers study the coma of a comet to understand its composition and behavior as it interacts with the solar wind.