antasthenic

ant·as·then·ic

(ant'as-then'ik),
1. Strengthening or invigorating.
2. An agent possessing such qualities.
[anti- + G. astheneia, weakness]

antasthenic

(ant″as-then′ik) [ anti- + -asthen(eia) + -ic]
Relieving weakness; strengthening, invigorating.