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Webster 1913 Edition

Adj.

[

Hetero-

+ Gr. [GREEK] being, essence.]

Having different essential qualities; of a different nature.

Noun.

(Eccl. Hist.)

One of those Arians who held that the Son was of a different substance from the Father.

heteroousian ‎(comparative more heteroousian, superlative most heteroousian)

having different essence or substance, especially with reference to the first and second persons of the Trinity