[buht-n-hohl] 
noun, verb, -holed, -hol⋅ing.| 1. | the hole, slit, or loop through which a button is passed and by which it is secured. |
| 2. | Chiefly British. a boutonniere. |
| 3. | Surgery. a short, straight incision through the wall of a cavity or a canal. |
| 4. | to sew with a buttonhole stitch. |
| 5. | to make buttonholes in. |
| 6. | to hold by the buttonhole or otherwise abruptly detain (someone) in conversation: The reporter tried to buttonhole the mayor for a statement on the bus strike. |
buttonhole
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buttonhole but·ton·hole (bŭt'n-hōl')
n.
A short straight surgical cut made through the wall of a cavity or canal.
The contraction of an orifice down to a narrow slit, as in mitral stenosis.
nˌhoʊl