Adjective
Of the same kind or nature; having the same substance or essence; coessential.
Source: Webster's dictionaryThe key to this father/son relationship is revealed by Stephen on the Sandymount strand when he contemplates the Nicene Creed and the 'consubstantial' relationship of God the Father to Son. Source: Internet
From this time to the end of the Arian controversies the word "consubstantial" continued to be the test of Catholic orthodoxy. Source: Internet