The Collaborative International Dictionary of English v.0.48:

Phytozoon \Phy`to*zo"["o]n\, n.; pl. Phytozoa. [NL., fr. Gr.
   fyto`n + zo^,on an animal.] (Zool.)
   A plantlike animal. The term is sometimes applied to
   zoophytes.
   [1913 Webster]