\Ho`moi*ou"si*an\, n. [Gr. ?, ?, of like substance;
"o`moios + o'ysi`a the substance, being, essence.] (Eccl.
Hist.)
One of the semi-Arians of the 4th century, who held that the
Son was of like, but not the same, essence or substance with
the Father; -- opposed to homoousian.

\Ho`moi*ou"si*an\, a.
Of or pertaining to Homoiousians, or their belief.