What's the difference between trigamous and trigamy?

Trigamous

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Definition:

• (a.) Having three sorts of flowers in the same head, -- male, female, and hermaphrodite, or perfect, flowers.

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Trigamy

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Definition:

• (n.) The act of marrying, or the state of being married, three times; also, the offense of having three husbands or three wives at the same time.

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