1. Filter consisting of a layer of sand or gravel for filtering water

Derived forms: filter beds

Type of: filter

• time of day
• time of departure
• time of life
• time of origin
• time of year
• time off
• time out of mind
• time period
• time plan
• time scale
• time series
• time sharing
• time sheet
• time signal
• time signature
• time slot
• time study
• time to come
• time trial
• time unit
• time value
• time warp
• time will tell
• time zone
• time-and-motion study