delta
noun/ˈdeltə/
/ˈdeltə/
- [countable] the fourth letter of the Greek alphabet (Δ, δ)
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- [countable] an area of land, like a triangle in shape, where a river has split into several smaller rivers before entering the sea
- the Nile Delta
- Delta[uncountable] a variant (= form) of the SARS-CoV-2 virus that was first reported in late 2020 and named ‘Delta’ in 2021. It became the main form of the virus worldwide until the Omicron variant appeared in late 2021.
- The Delta variant proved to be more transmissible than earlier variants of the virus.
Word Originsense 1 Greek, from Phoenician daleth.sense 2 mid 16th cent.: originally specifically as the Delta (of the River Nile), from the shape of the Greek letter.
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