Meanings

going back to sleep

the two solstices (summer and winter)

twenty years

secondary growth

secondary cooling water (esp. in a pressurized water reactor)

quadratic curve

secondary current

two people riding together (on a bike, etc.)

secondary circuit

quadric surface

secondary coil

secondary forest

secondary infection

secondary electron multiplier

to be faced with the choice between two alternatives

erhu (2-stringed Chinese instrument played with a bow)

ancient Chinese chromatic scale (primarily used in Japan for gagaku, etc.)

bivalves

second most important provincial shrine

bimodal