> Care to define what "extrude" means?

Shifting a face in the direction of its normal, and filling in the gaps 
between the shifted face and the other faces that it used to be connected to 
(by automatically adding more faces perpendicular to the selected face).

Example in amazing 2D ASCII:

Start with 3 faces:

---.---.---


Extrude the middle face upwards:

   .---.
   |   |
---.   .---


Move the left vertex up a bit:
   .
   |\
   | \
   |  \
   .   .
   |   |
---.   .---

Extrude the top left face:

.--.
|   \
|    \
|     \
.--.   .
   |   |
---.   .---

It's a very useful tool in 3D mesh design.

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