lu·bri·cant /ˈlubrɪkənt/
  (a.)潤滑的潤滑物,潤滑油,潤滑劑
  lu·bri·cant /ˈlubrɪkənt/ 形容詞
  潤滑劑,潤滑的,潤滑油
  Lu·bri·cant, n. That which lubricates; specifically, a substance, as oil, grease, graphite, etc., used for reducing the friction of the working parts of machinery.
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  lubricant
       n : a substance capable of reducing friction by making surfaces
           smooth or slippery [syn: lubricator, lubricating
           substance]