American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "knob" in a sentence
"While the knurled knob is pressing against the pane in two locations, it's not yet clear whether the glass has suffered any measurable damage."
"Turn the lower-right knob so that the flat side of the knob is facing Northwest"
"Turn the lower-left knob so that the flat side of the knob is facing Northeast"