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Difference between Blue devil and Blue devils

blue devil

1. (also: blueweed) a coarse prickly weed with spikes of blue flowers:

  • Blue devil is a coarse biennial Old World herb introduced as a weed in eastern North America.

2. (Drug users) a blue capsule or tablet containing barbiturate (also: bluebird):

  • I am spending far less than I was while taking those little blue devil pills.

Note: The expression does not correlate in meaning with the phrase blue devil fish—a reef fish (Paraplesiops bleekeri) inhabiting exposed reefs from 3 to 30 meters deep:

  • Blue devil fish are easily identified by the blue and white-banded body with yellow pectoral fins.

blue devils

1. a feeling of depression; despondency:

  • By the time that he had eaten his soup and drank a glass of wine, he had got rid of the fit of blue devils.

2. the apparitions seen in delirium tremens:

  • They, by a continued series of intoxication, become subject to what is popularly called the Blue Devils.