1 third of the ten Heavenly Stems 十天干[shí tiān gān]

2 third in order

3 letter "C" or Roman "III" in list "A, B, C", or "I, II, III" etc

4 ancient Chinese compass point: 165°

5 propyl

1 dopamine

1 melamine C3H6N6

1 propylene glycol

2 propane-1,2-diol C3H6(OH)2

1 forty-third year C7 of the 60 year cycle, e.g. 1966 or 2026

1 to burn down (idiom)