Contains

• extrusion

  Something that bulges out or is protuberant or projects from its surroundings; "the gun...

• spine

  Any sharply pointed projection.

• keel

  A projection or ridge that suggests a keel.

• tail

  Any projection that resembles the tail of an animal.

• jag

  A sharp projection on an edge or surface; "he clutched a jag of the rock".

• salient

  (military) the part of the line of battle that projects closest to the enemy.

• tongue

  Any long thin projection that is transient; "tongues of flame licked at the walls"; "rifles...