1930s; earliest use found in Charles Schuchert (1858–1942). Irregularly from classical Latin prōclīnāre.
1960s. From Proclus, the name of a neo-Platonist philosopher + -ine.
1960s; earliest use found in American Journal Orthodontics. From classical Latin prōclīnāre to cause to lean forward, to incline from pro- + -clīnāre.
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