The Chinese word for December is
十二月

shí èr yuè

Chinese Definition

December
1. 十二月份
2. 十二月
Components
十二
1. num. twelve; 12
十二宵夜 - twelve nights
二月
1. n. February
2. n. The modern name for the second month of the Chinese lunar calendar.
十
1. ten
2. (figurative) topmost; utmost
十分 - very
十全十美 - perfect
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.
月
1. (literary or dialectal) moon
2. moon-shaped objects
3. (literary) moonlight
4. month
Synonyms: 月份, wuu:號頭
5. monthly
月薪 - yuèxīn - monthly wage
6. Variant of 肉
7. Variant of 夕
8. Variant of 明