Did we just change the SCIENTIFIC definition of a VACCINE"

IF DEFINITIONS CAN BE CHANGED, WHAT HAPPENS TO TRUTH?

Here is the definition of "vaccine" from Webster's Dictionary of American English (1828) - VAC'CINE, a. [L. vaccinus, from vacca, a cow.]
Pertaining to cows; originating with or derived from cows; as the vaccine disease or cow-pox.