The best definition for the word "mortuary," considering that the prefix "mort-" means "death," is option b: tomb. To determine the correct definition, it is important to understand the meaning of the prefix "mort-," which in this case refers to death. Knowing this, we can eliminate options a, c, and d. A "parting gift" does not relate to death, "time of mourning" refers to a period of grieving rather than a physical location, and "rebirth" is the opposite of death. Therefore, the most suitable definition for "mortuary" is a tomb, which is a burial place for the dead.
