An organism or person that loves and thrives in sunlight and sunny conditions.
From heliophilia + -ac (a suffix used to form nouns referring to people or organisms with specific characteristics, similar to -iac in 'maniac').
Some people are heliophiliacs—they genuinely feel happier and more energetic in bright sunlight, which isn't just psychology but involves actual vitamin D production and circadian rhythm regulation in the brain!
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