Cantonese Dictionary

mercurochrome (lit., two hundred twenty)

As a Mandarin slang, 250 (or 二百五 pinyin er4 bai2 wu3) refers to someone who is mentally retarded, stupid or a failure with no useful skills. The slang is based on another slang ban diao zi (半弔子 [ban4diao4zi0]) which means something similar but to a much lesser extent. In ancient China, a bunch of 1000 copper coins tied together through the square holes in the center is called a diao (弔). Ban diao zi literally means half a diao (500 coins) which refers to a person who is inadequate in skills or mental abilities. Moderate Chinese scholars often call themselves ban diao zi in their own expertise areas as a humble gesture. Therefore ban diao zi is not necessarily a pejorative term depending on context of usage. On the contrary, Er bai wu (250) is half of a ban diao zi and it is meant as an insult. (source: Wikipedia)

dimercaprol

second-class citizen

nunchaku (also sometimes called "nunchucks", "numchuks")

disaccharide

one's parent (term of respect)

both [of them]; neither

either

second tone

a second pregnancy

a type of character in Chinese opera

2nd day of the month

an extension telephone

[math][comp sci] two's complement

Erlitou (archeological site at Yanshi, Henan)

second commander; second in command [written and colloquial]

a double explosion firecracker

second round (of a match or election)

Permian (geological period)

Erlianhaote (city in Inner Mongolia)

Binary

[math.] binary system

Binary system

[math.] binary scale

[math.] binary number

sit with one's legs crossed

glycol

Er guo tou, Chinese white liquor(lit., "head of the second pot" for second distillation)

[math] second order; quadratic