Definition of alastrim in English:

alastrim

noun

Medicine
  • A mild form of smallpox with a low mortality rate, caused by a variola virus of reduced virulence.

Origin

Early 20th century; earliest use found in The Lancet. From Brazilian Portuguese alastrim from alastrar to spread, disseminate, to sprinkle, to cover or steady with ballast (14th cent.; from a-, prefix + lastro ballast) + -im, suffix.

Pronunciation

alastrim

/əˈlastrɪm/