Definition of crotchets:
(n) :
(music) A musical note one beat long in 4/4 time.
(n) :
A forked support; a crotch.
(n) :
(military) The arrangement of a body of troops, either forward or rearward, so as to form a line nearly perpendicular to the general line of battle.
(n) :
(obsolete) A sharp curve or crook; a shape resembling a hook
(n) :
(archaic) A whim or a fancy.
(n) :
(surgery, now chiefly historical) A hook-shaped instrument, especially as used in obstetric surgery.