paramecium (noun) protozoan: minute organism
Sinonime: ephemeral,
evanescent,
fine,
gradual, impalpable, imponderable, inappreciable, inaudible, inconsiderable,
inconspicuous, indiscernible, indistinct, indistinguishable,
infinitesimal, insensible, insignificant,
intangible,
invisible, microscopic,
minute, momentary, shadowy,
slight,
small, subtle,
tiny,
trivial, undetectable, unobservable,
vague