flatline

Word parts

flat + line

Pronunciation

• IPA ^(key): /ˈflætˌlaɪn/

• Audio (AU)

  (file)

Noun

Singular flatline

Plural flatlines

1. (medicine) (cardiology) A flatline is the absence of heart contractions or brain waves.

Verb

Plain form flatline

Third-person singular flatlines

Past tense flatlined

Past participle flatlined

Present participle flatlining

1. (intransitive) (medicine) (cardiology) If a heart flatlines, it stops beating.
2. (intransitive) (medicine) (cardiology) (by extension) If a person flatlines, they die.