periodic
 n.— «I thought he had sobered up during our growing up years. I was wrong. He was what is known as a “periodic.” He revealed his dual life to my sister and to me as we entered college, then regularly showed up on campus to get drunk with his old frat brothers.» —“Sometimes, fathers set an example of what not to do” by S. Derrickson Moore Las Cruces Sun-News (New Mexico) June 16, 2007. (source: Double-Tongued Dictionary)

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