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[mass noun] The number of sets of chromosomes in a cell, or in the cells of an organism:[as modifier] ‘ploidy levels’
- ‘Grass genomes differ greatly in chromosome number, ploidy level, and size.’
- ‘Leaf size is increased by greater cell ploidy, but the mechanism of this effect is poorly understood.’
- ‘Four of the chromosome counts represented new ploidy levels.’
- ‘We used pollen grain size as an indicator of ploidy level by measuring length and width of the pollen grains under a microscope.’
- ‘Chromosome number and ploidy vary greatly and there is much overlap between them.’
1940s: from words such as (di)ploidy and (poly)ploidy.
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The definitions of ‘buddy’ and ‘bro’ in the OED have recently been revised. We explore their history and increase in popularity.