Final answer:
The prefix 'anti-' in the term antipruritic means c) 'against', indicating that an antipruritic is a substance used to prevent or relieve itching.
Step-by-step explanation:
The term antipruritic comes from the prefix 'anti-' and the root 'pruritic,' where 'pruritic' refers to itching. The prefix 'anti-' means against, and it indicates that the substance or medication referred to as antipruritic is used to counteract or prevent itching. Therefore, for the term antipruritic, the meaning of the prefix is C. Against.