Noun : campaign buttons.    From Dictionary.com. 

Verb (used with object) : She quickly buttoned her coat. ,He buttoned the top button of his shirt.    From Dictionary.com. 

Verb (used without object) : This coat buttons, but that one zips.    From Dictionary.com. 

A discrete transistor does the same kinds of things as a tube, using solid semiconductors, but it's much smaller, typically a buttonlike object well under a centimeter in diameter and thickness.    From Wordnik.com.  [Analog Science Fiction and Fact]

· Service pane is expandable to 350px now (50px more) · More buttonlike min/max/close buttons for Windows/Linux.    From Wordnik.com.  [Softpedia - Windows - All] Reference

The bites of insects often produce a papular eruption, but in many such cases the swelling extends wider into a buttonlike elevation, one-half to an inch in diameter.    From Wordnik.com.  [Special Report on Diseases of the Horse] Reference

In searching for them they may be readily detected by the hand if they have attained sufficient development in their usual situation, but must be distinguished from a small, bony enlargement that may be felt at the lower third of the cannon bone, which is neither a splint nor a pathological formation of any kind, but merely the buttonlike enlargement at the lower extremity of the small metacarpal or splint bone.    From Wordnik.com.  [Special Report on Diseases of the Horse] Reference