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protozoic (adj.)

1838, in geology, in reference to rocks containing fossils of the earliest life on Earth, from proto- "early, first" + Greek zoe "life" (from PIE root *gwei- "to live") + -ic. Coined by British geologist Adam Sedgwick, who wrote in 1852, "I used the word Protozoic to prevent any wrangling about the words Cambrian and Silurian" [Quarterly Journal of the Geological Society of London].

In zoology by 1861, "of or pertaining to the Protozoa," from Protozoa + -ic. Alternative adjectives in the biological sense include Protozoan, Protozoal.

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Definitions of protozoic from WordNet

protozoic (adj.)
of or relating to the Protozoa;
Synonyms: protozoal / protozoan
From wordnet.princeton.edu