retrovaccination

== English == === Alternative forms === retro-vaccination === Etymology === From retro- +‎ vaccination. === Noun === retrovaccination (countable and uncountable, plural retrovaccinations) (archaic, veterinary medicine medicine) The inoculation of a cow with human vaccine virus. === References === “retrovaccination”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.