DictionaryphlegmRespiratory mucus
noun

phlegm

FLEM/flem/

Thick mucus from the breathing passages.

She coughs up thick phlegm when she has a cold.

After coughing, a patient holds a tissue containing thick mucus while a doctor gestures from the patient's throat and chest to show where it came from.
Etymology

Greek phlegma meant inflammation or heat, and also a clammy bodily humor thought to be caused by heat. That bodily-fluid sense connects the fiery original meaning to thick mucus.

In context

Be Smart speaker14:11
Or take phlegm, it makes you think of that thick grossness in your throat when you're sick.
Some People Won't Be Able to Listen to This Video
Meera Syal3:18
And that's when he spat. The man in the T-shirt. It was a proper one. A big ball of phlegm.
'Just a T-shirt' written and performed by Meera Syal

More examples

  • He spits the phlegm into a tissue.
  • The nurse asks whether there is blood in the phlegm.
  • My cough brings up less phlegm today.

Forms

phlegmy adjective — Containing or producing thick respiratory mucus.

Similar words

mucus
A broader term for slippery secretions lining body passages.
sputum
Respiratory mucus that has been coughed or spit out.