Dissect vs Undefined - What's the difference?

As a verb dissect

is to study an animal's anatomy by cutting it apart; to perform a necropsy or an autopsy.

lacking a definition or value.

(en verb)

To study an animal's anatomy by cutting it apart; to perform a necropsy or an autopsy.

To study a plant or other organism's anatomy similarly.

To analyze an idea in detail by separating it into its parts.

(transitive, anatomy, surgery) To separate muscles, organs, and so on without cutting into them or disrupting their architecture.

Now dissect the triceps away from its attachment on the humerus.

(pathology) Of an infection or foreign material, following the fascia separating muscles or other organs.

* dissection

* * *

(wikipedia undefined) (-)

Lacking a definition or value.

(mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.

The result of division by zero is undefined .

* defined