Where does “phagocytary” come from?

phagocytary (English) comes from English phagocyte, from French phagocyter, from French -er, from Middle French -er, from Old French -ier — suffix used to form infinitives of first...

Ancestry of “phagocytary”, step by step

phagocytary traces back through two separate lines of ancestry.

via English phagocyte

StepLanguageWordMeaning
1EnglishphagocyteA cell of the immune system, such as a...
2Frenchphagocyterto phagocytize; to swallow up
3French-erForms infinitives of first-conjugation verbs
4Middle French-erForms infinitives of first-conjugation verbs;...
5Old French-iersuffix used to form infinitives of first...

via English ary

StepLanguageWordMeaning
1Englisharyany
2Englishe'erContraction of ever
3EnglisheverAlways, frequently, forever; Continuously,...
4Middle Englisheverever
5Old Englishǣfre
Every word from Old French -ierEvery word from French -erEvery word from Middle French -er