Bot. [f. L. bifor-is having folding doors or two openings (f. bi- two + foris door) + -INE.] A minute oval sac found in the green pulpy part of some leaves; so called from discharging its contents by an opening at each end.
1842. in Brande.
1870. Bentley, Bot., 34. Such cells have been called Biforines.
