An organism or cell that thrives in or shows affinity for blue light, or that readily absorbs blue dyes and stains.
From cyano- (Greek kyanos 'dark blue') + -phile (Greek philiein 'to love'). This term appears in both microbiology (light-loving organisms) and histology (dye-absorbing cells).
Some bacteria and algae are cyanophiles—they evolved to love blue light wavelengths because that's the light that penetrates deepest into water, so they positioned themselves to thrive in dim ocean depths.
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