The Chinese word for two is
二

èr

Chinese Definition

two
1. 二

Translations for two and their definitions

二
1. two
二號線 (èr hào xiàn) - line no. 2
2. second
二哥 - second elder brother
二意 - tr=èryì -
二心 - tr=èrxīn -
3. (handwritten, dated, now, informal) (An iteration mark denoting the repetition of the previous hanzi; often written at a smaller size when used for this purpose.)
Synonyms: 々, 〻
4. Short for "twenty, two hundred or two thousand" after hundreds, thousands and ten thousands.
※ (Such a definition of a number results from a number's being used without a unit after a quantity with both a value (exists even if hidden) and a unit to indicate the quantity with the value
百二 - one hundred twenty
百二 (pah jī) - one hundred twenty, MN
買電腦花了一千二。 (Mǎi diànnǎo huā le yī qiān èr.) - Buying the computer cost me a thousand and two hundred bucks.
5. Short for "twenty cents".
黃瓜一塊二一斤。 (Huángguā yī kuài èr yī jīn.) - The cucumbers are one dollar twenty per half kilogram.
6. (dialectal Mandarin) stupid, dumb; silly, thick, lacking mental agility (often in a cute way)
你這人怎麼這麼二！ (Nǐ zhè rén zěnme zhème èr!) - Why are you so incorrigibly stupid!
7. (HKC, school slang) to obtain a level two in a subject in DSE (exam) (usually implies failing the subject)
我中文man4-2 二咗，入唔到 Uju1。 - I got a level two in Chinese, can't get into university.
8. (classical) Alternative form of 貳; usually limited to the simplified script
不二过 - tr=bù'èrguò
9. usage. See 兩 - Usage notes.

兩
1. two
兩隻熱氣球 - two hot air balloons
2. two (used in radio communications in aviation and by the military)
3. some; few
你們這兩天真夠辛苦的。 - You've really been working hard the past few days.
4. different; distinct
兩樣 - difference
我們說的是兩回事。 - We are talking about different things.
5. =====Usage notes=====
6. tael (a traditional unit of weight)
7. (Mainland China) Short for 市兩, market tael, equal to 1/10 of a catty or 50 grams
8. (Hong Kong) equal to 1/16 of a catty or 37.7994 grams
9. (Taiwan) Short for 臺兩, Taiwanese tael, equal to 1/16 of a catty or 37.5 grams
10. (historical) metal currency unit used in China and Japan
11. Short for 公兩, hectogram
12. =====Usage notes=====
13. Original form of 輛
14. Variant of 魎