crotchet

Short definition from Wiktionary

Noun

1. 1
   A musical note one beat long in 4/4 time.
2. 2
   A sharp curve or crook; a shape resembling a hook
3. 3
   A hook-shaped instrument, especially as used in obstetric surgery.
4. 4
   A whim or a fancy.
5. 5
   A forked support; a crotch.
6. 6
   An indentation in the glacis of the covered way, at a point where a traverse is placed.
7. 7
   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.
8. 8
   A square bracket.

Verb

1. 1
   to play music in measured time
2. 2
   Archaic form of crochet (“knit by looping”).