二

dimer

Chemistry

dichromic acid; bichromic acid

double-lined mackerel (Grammatorcynus bilineatus)

middle pine tree to a noh stage (of the three placed in front of the bridge walkway)

two-country model (esp. China and Taiwan); two-country doctrine

pika (rabbit-like animal of family Ochotonidae)

double jeopardy

double electron capture

dual pricing

second-year ice

Buddhism

Treatise on the Two Entrances and Four Practices

Mathematics

binary operation; dyadic operation

Slang

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

Mahjong

winning hand composed of two sets of two identical chows plus a pair

Physics

two-body problem

erguotou; er guo tou; Chinese white liquor

carbon sink; carbon dioxide sink; CO2 sink

double penetration

derivative work

issuing (the same receipt) twice; issuing duplicate (receipts)

dual residence (in both the city and country)

Computing

bi-quinary system

Psychology

bicameral mind; bicameralism

Nihi (the two former provinces of Hizen and Higo)