Wiktionary(0.00 / 0 votes)Rate this definition: 1  simmer(Noun) The state or process of simmering. 2  simmer(Verb) To cook or undergo heating slowly at or below the boiling point. 3  simmer(Verb) To cause to cook or to cause to undergo heating slowly at or below the boiling point.
Middlesboro, Kentucky. Not to be confused with Middletown, Kentucky, near Louisville. Middlesboro (local /ËmÉªdÉlzbÉËrÉ/) is a home rule-class city in Bell County, Kentucky, United States. The population was 10,334 at the 2010 U.S. census, while its micropolitan area had a population of 69,060. It is located 1 mile west of the Cumberland Gap and is the largest city in southeastern Kentucky.
Middlesboro is served by the Middlesboro-Bell County Airport, which is a single runway, general aviation airport and is the second oldest airport still in use in Kentucky, ranking behind Bowman Field in Louisville.. The airport was established in 1944, however, the first recorded flight into the city was in 1912.