Standard Lemma guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
noun
A derivative of retinol having an extra double bond; vitamin A2.
Definition source: English Wiktionary via Wiktextract
Usage: uncountable
Topics: chemistry, natural-sciences, organic-chemistry, physical-sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
a viscous alcohol that is less active in mammals than is vitamin A1
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Synonyms: vitamin A2
Antonyms: none provided
Broader terms: vitamin A, antiophthalmic factor, axerophthol, A
History
Etymology tree Proto-Indo-European *de Proto-Indo-European *-h1 Proto-Indo-European *déh1 Proto-Italic *dē Latin dē Latin dē-der. English de- Ancient Greek ῠ̔δρο- (hŭdro-)der. English hydro- English retinol English dehydroretinol From de- + hydro- + retinol.
