Definition of omicrons:
(n) :
(sometimes capitalized) The 15th letter of the Classical and Modern Greek alphabets (16th in Ancient and Old Greek), used in ordering lists as in naming (astronomy) the 15th star of a constellation or (epidemiology) the 15th discovered major variant of a disease.
(n) :
(virology, pathology) Ellipsis of Omicron variant. [(virology) The highly virulent B.1.1.529 strain of the SARS-CoV-2 virus that causes COVID-19.]
(n) :
(virology, pathology, uncountable) Ellipsis of Omicron variant. [(virology) The highly virulent B.1.1.529 strain of the SARS-CoV-2 virus that causes COVID-19.]
(n) :
(countable) Alternative form of omicron (Greek letter) (especially in the majuscule form) [(sometimes capitalized) The 15th letter of the Classical and Modern Greek alphabets (16th in Ancient and Old Greek), used in ordering lists as in naming (astronomy) the 15th star of a constellation or (epidemiology) the 15th discovered major variant of a disease.]
(n) :
Ellipsis of Omicron Hill: a mountain in North Slope borough, Alaska, United States.