A.C.S.

1. Advanced Communications System.

2. American Cancer Society.

3. American Chemical Society.

4. American College of Surgeons.

Also ACS.

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A.C.S.,

antireticular cytotoxic serum, obtained from rabbits' blood injected with spleen and rib marrow of guinea pigs, a substance that may increase the activity and growth of the liver, spleen, and certain other tissues.