vitamin A2
- noun
- /ˈvaɪtəmɪn eɪ tu/
- Specialized
:
vitamina A2
- Compared to vitamin A1, vitamin A2 is less efficient in supporting mammalian vision.
Examples
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Research has shown that vitamin A2 is present in the retinas of some freshwater fish.
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Is vitamin A2 important for eye health?
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Scientists are studying the nutritional roles of vitamin A2 in various animal species.
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Fish such as cod liver oil contain vitamin A2.
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Research has confirmed that vitamin A2 plays a significant role in the vision of certain fish species.
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Some amphibians obtain necessary nutrients from vitamin A2 for their growth and development.
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Certain diets rich in fish are beneficial because they provide vitamin A2 that supports healthy eyesight.
Synonyms
A thick form of vitamin A found in fish that is less active in mammals
Surface Forms
Morphology
vitamin + A2
The headword 'vitamin' clearly signals a nutrient class, and the label 'A2' functions as a subtype identifier rather than a lexical word, so learners can infer this is a specific kind of vitamin A but cannot derive the detailed biochemical meaning from the parts. Because the numeral-letter tag gives partial information (a variant of vitamin A) but not the full, specialized sense, it is only partially transparent to a B1 learner.
Etymology
Vitamin A2 was named as the 'second' kind of vitamin A after vitamin A1 because scientists found a very similar substance with a small change. That small change makes it work well in some fish and amphibians but less well in mammals, so it is called the 'A2' form.
