interscendent

from The Century Dictionary.

• In algebra, containing radicals in the exponents: thus, or is an interscendent expression: so called by Leibnitz as being intermediate between algebraic and transcendental quantities, but properly belonging to the latter category.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Math.) Having exponents which are radical quantities; -- said of certain powers.
• adjective a series whose terms are interscendent quantities.