protoctist

/prəʊˈtɒktɪst/
noun
1.
(in modern biological classifications) any unicellular or simple multicellular organism belonging to the kingdom Protoctista, which includes protozoans, algae, and slime moulds
Word Origin
C19: from New Latin protoctista, perhaps from Greek prototokos first born
protoctist in Medicine

protoctist pro·toc·tist (prō'tək-tĭst)
n.
A eukaroytic, unicellular organism belonging to the kingdom Protoctista, which includes protozoa, slime molds, and certain algae.

protoctist in Science
protoctist
  (prə-tŏk'tĭst)   
See protist.