Source : Webster's Revised Unabridged Dictionary (1913)

Coetaneous \Co`e*ta"ne*ous\, a. [L. coaetaneus; co- + aetas
   age.]
   Of the same age; beginning to exist at the same time;
   contemporaneous. -- {Co`e*ta"ne*ous*ly}, adv.

         And all [members of the body] are coetaneous.
                                                  --Bentley.