What is pleomorphic / pleomorphism?

"Pleo-morphism means many forms; many or more (pleo-), forms or bodies (morph-), capable of changing from one type of organism to another."
https://www.healingnaturallybybee.com/you-cannot-catch-bugs-germs-bacteria-or-candidafungi/

"Even more, he found the BX virus to be pleomorphic"
https://behiveofhealing.com/forgotten-genius-royal-raymond-rife/

"Bechamp went much further in his argument for pleomorphism. He contended that bacteria could ‘devolve’ into smaller, unseen forms—what he called microzyma. In other words, Bechamp developed—on the basis of a lifetime of research—a theory that micro­organisms could change their essential size as well as their shape, depending on the state of health of the organism in which the micro-organism lived"
https://www.cruxofhealth.com/pleomorphism/

"Gaston Naessens’ somatid theory of the origins of cancer, the result of over 40 years of research in bacteriology and biology (the last 20 funded personally by the late David Stewart of the MacDonald-Stewart Foundation), has its roots in the concept of pleomorphism, first advanced by Antoine Bechamp in France in the 1870’s. Pleomorphism is the assumption of multiple forms, or stages, by a single organism during its life cycle"
http://adistantmirror.com/gaston-naessens-somatid-and-somatoscope/