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del​ta
noun
del·​ta
ˈdel-tə
plural del​tas

Definition (Entry 1 of 2)

  • the 4th letter of the Greek alphabet
    — see Alphabet Table
  • something shaped like a capital Greek delta
    especially, geology the alluvial deposit at the mouth of a river //the Mississippi Delta
  • mathematics an increment of a variable —symbol Δ
  • delta wave //During deep sleep, the brain operates in delta wave frequency. But it's difficult to go from beta to theta then delta without first switching down to a relaxed alpha state. — Daily Mail (London)
  • or less commonly Delta delta variant //As SARS-CoV-2 continues to spread among humans, natural selection and adaptation will result in more variants that could plausibly be more transmissible than delta. — Suresh V. Kuchipudi
adjective

Definition (Entry 2 of 2)

  • chemistry
  • fourth in position in the structure of an organic (see organic entry 1 sense 1b(2)) molecule from a particular group or atom —symbol δ
Other Words
Noun
  • del​ta​ic del-ˈtā-ik adjective
pained — MW · Shobdo