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protoheme
protohemin
Protohippus
protohistory
protology
protomammal
Protomartyr
Protomerite
Protometals
Protomorphic
proton
proton accelerator
proton magnetic resonance
Proton Pump Inhibitors
Protonema
Protonotary
-- Protoorganism --
Protopapas
Protophyte
Protophytology
Protopine
Protoplasm
Protoplasmatic
Protoplasmic
protoplasmic astrocyte
Protoplast
Protoplasta
Protoplastic
Protopodite
Protopope
Protopterus
Protosalt
Protosilicate
Protoorganism
Pro`to`or´gan`ism
n.
1.
(Biol.)
An
organism
whose
nature
is
so
difficult
to
determine
that
it
might
be
referred
to
either
the
animal
or
the
vegetable
kingdom
.
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