vitamin D

noun

Definition of vitamin D

: any or all of several fat-soluble vitamins chemically related to steroids, essential for normal bone and tooth structure, and found especially in fish-liver oils, egg yolk, and milk or produced by activation (as by ultraviolet irradiation) of sterols: such as

a or vitamin D₂ \ -ˈdē-ˈtü \ : calciferol

b or vitamin D₃ \ -ˈdē-ˈthrē \ : cholecalciferol

Examples of vitamin D in a Sentence

Recent Examples on the Web

Many consumers don’t have a problem with eating fish, which gets rave reviews from doctors and nutritionists for being relatively low in fat while loaded with nutrients, including vitamin D and omega-3 fatty acids. — Anne Marie Chaker, WSJ, "Fish: The Final Frontier in Fake Meat," 15 Oct. 2018 Being in the sun also prompts your body to make more vitamin D, so that’s yet another process adding to its workload. — Nina Bahadur, SELF, "Why Does Spending Time in the Sun Make You So Tired?," 8 Sep. 2018 To help with calcium absorption, prenatal vitamins may also have some vitamin D, which may be hard to get enough of during the day depending on your diet and sun exposure. — Cassie Shortsleeve, SELF, "Do I Really Need to Take Prenatal Vitamins Before I’m Even Pregnant?," 19 Apr. 2018 Also, American food is highly fortified with vitamin D in milk, iodine in salt, B vitamins in flour, even calcium in some brands of orange juice. — Liz Szabo, chicagotribune.com, "Older Americans are hooked on vitamins despite scarce evidence they work," 6 Apr. 2018 Also, American food is highly fortified — with vitamin D in milk, iodine in salt, B vitamins in flour, even calcium in some brands of orange juice. — Liz Szabo, USA TODAY, "Are you over 65 and take vitamins? They don't usually help — and sometimes they harm," 4 Apr. 2018 Also, American food is highly fortified — with vitamin D in milk, iodine in salt, B vitamins in flour, even calcium in some brands of orange juice. — Liz Szabo, Washington Post, "Older Americans Are Hooked On Vitamins Despite Scarce Evidence They Work," 4 Apr. 2018 Major risk factors for accidental falls include lower body weakness, vitamin D deficiency (this nutrient helps with bone strength), vision problems, medicines that affect balance, difficulty walking, and more, according to the CDC. — Carolyn L. Todd, SELF, "Emergency Responders Share 9 of the Biggest Death Traps in Your Home," 14 July 2018 Cooperman, 55, opts for B12, vitamin D in the winter, and iron after donating blood. — Peter Andrey Smith, Outside Online, "Don't Trust the Label on Your Supplements," 5 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'vitamin D.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.