phylum Pyrrophyta

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Also see: Pyrrophyta

Concise Oxford English Dictionary © 2008 Oxford University Press:
phylum /ˈfʌɪləm/

▶noun (pl. phyla /-lə/)

• 1 Zoology a principal taxonomic category that ranks above class and below kingdom, equivalent to the division in botany.

• 2 Linguistics a group of languages related to each other less closely than those forming a family.

– origin C19: mod. L., from Gk phulon ‘race’.