Jugular (adjective)

1. Relating to or located near the jugular vein, which carries blood from the head to the heart.
2. Critical or vital, especially with respect to a weakness or a vulnerability that can be exploited.

Origin:

Derived from the latin word 'jugulum' meaning the neck or the throat.

Examples:

1. The doctor checked the patient's jugular pulse, to monitor the heart rate and the blood pressure.
2. The attacker targeted the enemy's jugular, to deliver a swift and decisive blow.
3. The researcher found the jugular issue, that caused the system to crash and fail.
4. The politician exposed the jugular flaw, that made the opposition's argument unsustainable.
5. The engineer fixed the jugular error, that prevented the software from functioning properly.