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Webster 1913 Edition

Proteus

Pro′te-us

,
p
rop.
Noun.
[L., Gr. [GREEK].]
1.
(Class. Myth.)
A sea god in the service of Neptune who assumed different shapes at will. Hence, one who easily changes his appearance or principles.
3.
A changeable protozoan; an amoeba.

Webster 1828 Edition

Proteus

PRO'TEUS

,
Noun.
[L.] In mythology, a marine deity,the son of Oceanus and Tethys, whose distinguishing characteristic was the faculty of assuming different shapes. Hence we denominate one who easily changes his form or principles, a Proteus.

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