subcortical

adj

1. (not-comparable)Of or pertaining to the subcortex, the portion of the brain located below the cerebral cortex

   “He was diagnosed with subcortical dementia.”

2. (not-comparable)Beneath the bark of trees.

   “More than two-thirds of the trees evidenced subcortical beetles, but no root decay fungi. The latter, without the former, were found in only 2 to 3 percent of the trees.”