hy·dro·sul·fu·rous acid 
(hī′drō-sŭl-fyrəs, -sŭlfər-əs)
(hī′drō-sŭl-fyrəs, -sŭlfər-əs)n.
See dithionous acid.
- time after time
- time and again
- time and a half
- time and motion study
- time bomb
- time capsule
- timecard
- time clock
- time-consuming
- time deposit
- time dilation
- time draft
- timed-release
- time exposure
- time frame
- timeframe
- time-honored
- time immemorial
- timekeeper
- timekeeping
- time-lapse
- timeless
- timelessly
- timelessness
- timeline