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From The Collaborative International Dictionary of English v.0.48:
Oiler \Oil"er\, n. 1. One who deals in oils. [1913 Webster] 2. One who, or that which, oils. [1913 Webster] 3. An oil tanker. [PJC] 4. A ship which is powered by oil. [PJC] 5. An oilcan. [PJC]