pantothenic (adj.)youdaoicibaDictYouDict
denoting a B-complex vitamin acid, 1933, from Greek pantothen "from all quarters, on every side," from panto-, comb. form of pantos, genitive of pan "all" (see pan-) + -ic. So called because it was found in so many sources.
vitamin (n.)youdaoicibaDictYouDict
1920, originally vitamine (1912) coined by Polish biochemist Casimir Funk (1884-1967), from Latin vita "life" (see vital) + amine, because they were thought to contain amino acids. The terminal -e formally was stripped off when scientists learned the true nature of the substance; -in was acceptable because it was used for neutral substances of undefined composition. The lettering system of nomenclature (Vitamin A, B, C, etc.) was introduced at the same time (1920).
cryptoxanthinyoudaoicibaDictYouDict
"A yellow carotenoid pigment which is a metabolic precursor of vitamin A and is commonly found in plants and in other sources such as egg yolk", 1930s; earliest use found in Chemical Abstracts. From crypto- + xanthin, after German Kryptoxanthin.
nyctalopiayoudaoicibaDictYouDict
"A condition characterized by an abnormal inability to see in dim light or at night, typically caused by vitamin A deficiency", Late 17th century: via late Latin from Greek nuktalōps, from nux, nukt- 'night' + alaos 'blind' + ōps 'eye'.