| amobarbital sodium | (n) the sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic, Syn. Amytal, blue devil, blue angel, blue |
| blues | (n) a state of depression, Syn. blue devils, megrims, vapours, vapors |
| blueweed | (n) a coarse prickly European weed with spikes of blue flowers; naturalized in United States, Syn. blue devil, viper's bugloss, blue thistle, Echium vulgare |
| Saphir-Riffbarsch { m } (Chrysiptera cyanea) [ zool. ] | blue damsel; blue devil (damsel) [Add to Longdo] |
| Südsee-Demoiselle { f } (Chrysiptera taupou) [ zool. ] | Fiji blue devil [Add to Longdo] |