[1] : The Collaborative International Dictionary of English v.0.48

shrove \shrove\,
   imp. of shrive.
   1913 webster

   shrove sunday, quinguagesima sunday.

   shrove tuesday, the tuesday following quinguagesima sunday,
      and preceding the first day of lent, or ash wednesday.

   note: it was formerly customary in england, on this day, for
         the people to confess their sins to their parish
         priests, after which they dined on pancakes, or
         fritters, and the occasion became one of merriment. the
         bell rung on this day is popularly called pancake bell,
         and the day itself pancake tuesday. --p. cyc.
         1913 webster
see also:
shrive shrove sunday shrove tuesday 

[2] : The Collaborative International Dictionary of English v.0.48

quinquagesima \quin`quages"ima\, a. l., fr. quinquagesimus
   the fiftieth, akin to quinquaginta fifty, quinque five. see
   five.
   fiftieth.
   1913 webster

   quinquagesima sunday, the sunday which is the fiftieth day
      before easter, both days being included in the reckoning;
      -- called also shrove sunday.
      1913 webster
see also:
five quinquagesima sunday shrove sunday 

Shrove >> S Words
Shrove, definition of term: Shrove
shrove_pag1.html

Sunday >> S Words
Sunday, definition of term: Sunday
sunday_pag1.html

Trinity Sunday >> T Words
Trinity Sunday, definition of term: Trinity Sunday
trinity+sunday_pag1.html

Passion Sunday >> P Words
Passion Sunday, definition of term: Passion Sunday
passion+sunday_pag1.html

Palm Sunday >> P Words
Palm Sunday, definition of term: Palm Sunday
palm+sunday_pag1.html

Low Sunday >> L Words
Low Sunday, definition of term: Low Sunday
low+sunday_pag1.html