The cells that go across the spreadsheet horizontally is called a row of cells.
Concentration Gradient.. :)
action potential
concentration gradient
action potential
action potential
an answer that your computer gives you!
The term that refers to water vapor moving horizontally is "advection." It describes the process of air or water transporting heat, moisture, or other properties horizontally.
This is called the osmotic gradient.
A field is more a database term than a spreadsheet term. In a spreadsheet a field can refer to a column of data that is of the same type, like all numbers or all dates or birth or all home addresses etc. This would be in a case where your spreadsheet is laid out similar to a database table.
It can be called a worksheet. There is a range of actual spreadsheet programs, so people often refer to them directly, like Excel or Quattro or Works or Open Office or Lotus 123, instead of using the term spreadsheet.
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Your question is very strange, one would not normally use that term in relation to a spreadsheet. However voluminous would mean "lots of".