Definition of breakthrough pain in English:

breakthrough pain

Syllabification: break·through pain

Entry from US English dictionary

noun

(Usually in connection with cancer) severe pain that erupts while a patient is already medicated with a long-acting painkiller.

Definition of breakthrough pain in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal