Please illustrate me...

[mendezj]

A blade has basically three dimensions: length, width, and? How would you refer to the height (?) from spine to edge? Thank you.

 

[Dadpool]

Length, width, and thickness. Although I've also heard height and width used interchangeably.

The dimension you're asking about is width.

 

[mendezj]

Length, width, and thickness. Although I've also heard height and width used interchangeably.

The dimension you're asking about is width.

Perfect. Thank you so much.

 

[Ruari]

Depth is what I'd use for the spine to edge plane.
*edit* Height would also work...

 

[The Aflac Duck]

Girth

 

[Ruari]

Girth

(advertising picture, not mine)

 

[Smaug]

Length is the longer dimension. (looking from the side)
Width is the shorter dimension. (looking from the side)
Thickness is looking from the spine.

 

[E.D.C.]

Smaug and Dadpool nailed it.