Meanings

hook turn

regular icosahedron

icosahedron

dodecahedron

regular dodecahedron

two or three days

binary operation

second law of thermodynamics

double standard

double standard

double take (esp. out of surprise)

Twelfth Night

duality

double blind test

blues experienced by man who did not receive Valentine's day chocolate

secondary use

second magnitude star

between short and second

two forces (of yin and yang)

Second World