PABA

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Definition

Noun: 1. Para-aminobenzoic acid: A metabolic acid found in yeast and liver cells; used to make dyes, drugs, and sun blockers. It is a member of the B-complex vitamins.

Usage
  • PABA is a specific chemical compound. It is typically used in scientific, medical, and cosmetic contexts.
  • It is an uncountable noun (e.g., , ).
Examples
  • Scientific/Medical Context:
    • Some bacteria require PABA for growth.
    • The study examined the metabolic role of PABA in liver cells.
  • Consumer Product Context:
    • This sunscreen is labeled "PABA-free."
    • Early sunscreens often contained PABA as an active ingredient.
Advanced Usage
  • "PABA-free": A common label on sunscreens and cosmetics indicating the product does not contain para-aminobenzoic acid, often due to concerns about skin irritation or allergies.
    • I only buy PABA-free sunscreen for my sensitive skin.
Variants and Related Words
  • Para-aminobenzoic acid: The full chemical name for PABA.
  • Aminobenzoic acid: A broader chemical category to which PABA belongs.
Synonyms
  • 4-Aminobenzoic acid
  • Vitamin Bx (a historical, non-standard name)
Notes
  • PABA is an acronym. It is often written in all capital letters.
  • While historically considered part of the B-vitamin complex, it is not officially classified as an essential vitamin for humans.
Noun
  1. a metabolic acid found in yeast and liver cells; used to make dyes and drugs and sun blockers

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