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noun | abbreviation
Bya n
geochron. billion years ago (MichaelBurov); gigayears ago (MichaelBurov); Bys ago (MichaelBurov); Gys ago (MichaelBurov)
BYA abbr.
abbr. Billions Of Years Ago
abbr., avia. Boundary, Alaska USA
abbr., biotechn. brewer's yeast autolyzate (igisheva)