What term describes a form of polygamy where a woman has multiple husbands?

The correct term that describes a form of polygamy where a woman has multiple husbands is polyandry. Polyandry is relatively rare compared to polygyny (where a man has multiple wives) and can be found in some cultures as a means of resource management or ensuring the survival of certain familial or economic structures. This arrangement often serves to distribute resources efficiently among a family or community, especially in environments where resources are limited.

Monogamy, on the other hand, refers to a relationship structure where an individual has only one partner at a time, which does not fit the definition provided. Sororal marriage refers to a specific type of polygyny where a man marries sisters, which does not align with the concept of a woman having multiple husbands. Thus, polyandry distinctly defines the situation described in the question, making it the appropriate answer.