Definition of alterant in US English:

alterant

adjective

  • 1That causes alteration or change. Now rare.

  • 2Medicine= "alterative". Now historical.

noun

  • Generally. Anything which causes an alteration or change of state in something.

Origin

Early 17th century; earliest use found in Francis Bacon (1561–1626), lord chancellor, politician, and philosopher. From post-classical Latin alterant-, alterans, present participle of alterare alter. In use as noun in sense B. 1 after French altérant alterative medicine, use as noun of altérant alterative, use as adjective of present participle of altérer. In use as noun in sense B. 2 after post-classical Latin alterant-, alterans, use as noun of present participle of alterare.