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1.
of or relating to a penis consisting of a single atom;
"Phill and Matt have monatomic knobs"
by mikkachops September 20, 2007

Words related to monatomic

penis knob knobs microscopic phill small tiny
 
2.
Phrase used to describe an element whose atoms are not connected to each other in its pure (unreacted) state.
Helium, Xenon, Sodium...take your pick
by Shawn B. September 29, 2003