Definition of ingravescent in US English:

ingravescent

adjective

Medicine
  • (of a condition or symptom) gradually increasing in severity.

    • ‘The diagnosis of Crohn's disease makes surgery mandatory in any form of the disease, because it is ingravescent.’
    • ‘Radiation-induced arteriopathy is an ingravescent chronic lesion involving a myointimal hyperplasia and a remarkable fibrosis of the arterial outer layers.’

Origin

Early 19th century: from Latin ingravescent- ‘growing heavy or worse’, from the verb ingravescere (based on gravis ‘heavy’).

Pronunciation

ingravescent

/ˌinɡrəˈves(ə)nt/