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ancient Chinese chromatic scale (primarily used in Japan for gagaku, etc.)
Biology
diploid (organism, cell, etc.); diplont
biracial
after two outs
Botany
biennial; biennial plant
Mathematics
square root
secondary forest; second-growth forest
silk brocade eggs; nishiki tamago; sweet steamed layered egg cake
full duplex; FDX
double cocoon
entertainment quarters (food and geisha)
two half hitches
binomial
jacketed kettle; double boiler
double duty
two-wire-system
second-degree relative
second crop
half duplex; HDX
two flags
divalent
two-stringed koto
Mahjong
winning hand with the score doubled twice
quadratic field
