IPA: /ˌpɒlɪˈplɔɪdi/
KK: /pɑˈlɪpˌlɔɪdi/
The condition of having more than two complete sets of chromosomes in an organism.
Polyploidy is common in plants and can lead to increased size and vigor.
Polyploidy → It is formed from "poly-" (from Greek "polus", meaning many) and "ploidy" (from Greek "ploides", meaning fold or layer). The term describes a condition in which a cell or organism has more than two paired (homologous) sets of chromosomes, hence many layers of genetic material.
Think of 'many' ('poly-') layers or sets ('ploidy') of chromosomes to remember that polyploidy refers to having multiple sets of chromosomes.