tweener
n.— «The subject of Keokuk and six other hospitals in Iowa, referred to as “tweeners,” that are neither eligible for funding as large urban centers nor small critical access hospitals was explored along with Medicare reimbursement.» —“Preparation impresses U.S. senator as Southeast Iowa takes issues to D.C.” by Cindy Iutzi Gate City (Keokuk, Iowa) May 11, 2007. (source: Double-Tongued Dictionary)