In Excel, a vertical arrangement of data items is called a column, horizontally it’s called a row, and a particular row x column combination gives you a single data item contained in a cell. What is the equivalent nomenclature for an R data frame or tibble?

I have spent a while googling an answer, but with no luck. It seemed this was a more appropriate place to ask than Stack Overflow, but please correct me if I’m wrong. Thank you.