天干

tiāngān
the 10 heavenly stems 甲 jiǎ, 乙 yǐ, 丙 bǐng, 丁 dīng, 戊 wù, 己 jǐ, 庚 gēng, 辛 xīn, 壬 rén, 癸 guǐ, used cyclically in the calendar and as ordinal numbers I, II etc

CEDICT

Entry Composition

1 天 tiān
  1. day
  2. sky
  3. heaven
=2 干 gān old variant of 乾 gān
=2 干 gān
  1. dry
  2. dried food
  3. empty; hollow
  4. taken in to nominal kinship; adoptive; foster
  5. futile; in vain
  6. (dialect) rude; blunt
  7. (dialect) to cold-shoulder
=2 干 gān variant of 乾 gān
=2 干 gān
  1. (bound form) to have to do with; to concern oneself with
  2. one of the ten heavenly stems 天干 tiāngān
  3. (archaic) shield