氧还

氧還
yǎnghuán
  1. (chemistry) short for 氧化還原／氧化还原 (yǎnghuà huányuán, “to oxidise and reduce”)
  2. short for 氧化還原／氧化还原 (yǎnghuà huányuán, “to oxidise and reduce”)

Wiktionary

Entry Composition

1 氧 yǎng oxygen (chemistry)
=2 还 Huán surname Huan
=2 还 hái
  1. still
  2. still in progress
  3. still more
  4. yet
  5. even more
  6. in addition
  7. fairly
  8. passably (good)
  9. as early as
  10. even
  11. also
  12. else
=2 还 huán
  1. to pay back
  2. to return