adjective
salivary
SAL-uh-vair-ee/ˈsæləveri/
Relating to saliva or the glands that produce it.
Your salivary glands release fluid that helps you swallow food.

Etymology
The pieces mean “relating to spittle.” The adjective first described things secreting or containing saliva, then broadened to anything pertaining to this mouth fluid.
In context
it's being mixed with saliva that's produced from the salivary glands and that saliva contains some digestive enzymes