Having the nature of essence; not physical.
Necessary.
Necessary for survival but not synthesized by the organism, thus needing to be ingested.
Being in the basic form; showing its essence.
Really existing; existent.
Very important; of high importance.
Such that each complementary region is irreducible, the boundary of each complementary region is incompressible by disks and monogons in the complementary region, and no leaf is a sphere or a torus bounding a solid torus in the manifold.
Idiopathic.
A necessary ingredient.
A fundamental ingredient.
Of the inner nature of a thing.
Within the body.
Concerned with the domestic affairs of a nation, state or other political community.
Applied or intended for application through the stomach by being swallowed.
Concerned with the non-public affairs of a company or other organisation.
Attending a university as well as taking its examinations.
Of or situated on the inside.
Experienced in one's mind; inner rather than expressed.
Present or arising within an organism or one of its parts.