What is defined as an irrational, exaggerated fear of death?

Thanatophobia is specifically defined as an irrational or excessive fear of death. This term combines the Greek word "thanatos," meaning death, with "phobia," which indicates an irrational fear. Individuals experiencing thanatophobia may have overwhelming anxiety at the thought of their own death or the death of loved ones, which can significantly impact their daily lives and emotional well-being. The other terms provided in the question relate to various aspects of mental health and suicide but do not specifically denote an irrational fear of death.

Thanatology refers to the study of death and dying, focusing more on understanding and research rather than a fear associated with death. A suicidal gesture typically refers to actions taken with the intent of signaling suicidal feelings without genuinely intending to end one's life, whereas suicidal ideation involves thoughts about suicide itself. Neither of these terms captures the essence of an irrational fear of death, making thanatophobia the accurate choice for the question asked.