2 definitions
for protozoon
From The Collaborative International Dictionary of English v.0.48 :
Protozoon \Pro`to*zo"["o]n\ (-[o^]n), n.; pl. Protozoa. [NL.]
(Zool.)
(a) One of the Protozoa.
(b) A single zooid of a compound protozoan.
[1913 Webster]
From WordNet (r) 2.0 :
protozoon
n : any of diverse minute acellular or unicellular organisms
usually nonphotosynthetic [syn: protozoan]