Select the most appropriate one-word substitution for the given group of words.

The practice of  having more than one husband at the same time 

Polyandry

The most appropriate one-word substitution for "the practice of having more than one husband at the same time" is polyandry.

• Polyandry is the practice of one woman having multiple husbands.
• Polygamy is the practice of one person having multiple spouses, regardless of gender.
• Senile is a term for someone who is showing signs of old age, especially mental decline.
• Monogamy is the practice of having one spouse at a time.