vaccinist noun 2adjective 1forms 3 noun2 •One who administers vaccines. •(no longer used) One who is in favor of the use of vaccination. adjective1 •In favor of vaccination.Instead of its being true that the anti-vaccinationists "alone have been examined so far," the fact is that of the scores of witnesses examined a large proportion are vaccinist. — 1893 formsvaccinists · more vaccinist · most vaccinist