予防法の定義と意味 - メリアム・ウェブスター

PROPHYLAXIS Definition & Meaning - Merriam-Webster Est. 1828 Dictionary Definition Definition Did you know? Example Sentences Word History Phrases Containing Rhymes Entries Near Cite this Entry Citation Medical Definition Medical More from M-W Show more Show more Citation Medical More from M-W Save Word To save this word, you'll need to log in. Log In prophylaxis noun pro·​phy·​lax·​is ˌprō-fə-ˈlak-səs also ˌprä- plural prophylaxes ˌprō-fə-ˈlak-ˌsēz also ˌprä- : measures designed to preserve health (as of an individual or of society) and prevent the spread of disease Did you know? In Greek, phylax means "guard", so prophylactic measures guard against disease by taking action ahead of time. Thus, for example, before the polio vaccine became available, prophylaxis against polio included avoiding crowds and public swimming pools. These days a well-known kind of prophylactic is used to prevent sexually transmitted diseases; but prophylactic measures only work when people use them. Examples of prophylaxis in a Sentence Recent Examples on the Web Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback . Lewin wrote to Rubio that the number of pregnant and breastfeeding mothers who began pre-exposure prophylaxis through PEPFAR more than doubled. — Shannon K. Kingston, ABC News , 17 Apr. 2026 The drug has been in demand after studies showed a single set of injections every six months can offer virtually complete protection from infection, a form of prevention known as preexposure prophylaxis , or PrEP. — Ed Silverman, STAT , 30 Mar. 2026 Most people who were not in close contact do not need prophylaxis . — Katia Hetter, CNN Money , 20 Mar. 2026 The event was sponsored by MISTR, a telemedicine platform that provides online access to pre-exposure prophylaxis (PrEP) and long-term HIV care. — Kevin Dolak, HollywoodReporter , 18 Mar. 2026 See All Example Sentences for prophylaxis Word History Etymology borrowed from New Latin, from Greek prophylak-, stem of prophylássein "to keep guard before a place, be on guard, (middle voice) to be on one's guard against, take precautions against" (from pro- pro- entry 1 + phylássein "to keep watch on, guard, preserve," derivative of phylak-, phýlax "guard, guardian, protector") + -sis -sis — more at phylactery First Known Use 1683, in the meaning defined above Time Traveler The first known use of prophylaxis was in 1683 See more words from the same year Phrases Containing prophylaxis postexposure prophylaxis pre - exposure prophylaxis Rhymes for prophylaxis chemotaxis epistaxis anaphylaxis axis praxis taxus chemoprophylaxis See All Rhymes for prophylaxis Browse Nearby Words prophylactically prophylaxis prophylaxy See all Nearby Words Cite this Entry Style MLA Chicago APA Merriam-Webster “Prophylaxis.” Merriam-Webster.com Dictionary , Merriam-Webster, https://www.merriam-webster.com/dictionary/prophylaxis. Accessed 5 May. 2026. Copy Citation Medical Definition prophylaxis noun pro·​phy·​lax·​is -ˈlak-səs plural prophylaxes -ˈlak-ˌsēz : measures designed to preserve health and prevent the spread of disease : protective or preventive treatment prophylaxis against viral diseases a paste containing fluorine for dental prophylaxis More from Merriam-Webster on prophylaxis Britannica.com: Encyclopedia article about prophylaxis Last Updated: 20 Apr 2026 - Updated example sentences Love words? Need even more definitions? Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Merriam-Webster unabridged More from Merriam-Webster Word of the Day augur See Definitions and Examples » Get Word of the Day daily email! Popular in Grammar & Usage See More More Commonly Mispronounced Words 5 Verbal Slip Ups and Language Mistakes Is that lie 'bald-faced' or 'bold-faced'? The Difference Between 'i.e.' and 'e.g.' Why is '-ed' sometimes pronounced at the end of a word? See More Popular in Wordplay See More The Longest Long Words List 9 Other Words for Beautiful The Words of the Week - May 1 Was 'nervous Nellie' a Real Person? 12 Lovely and Unusual Words for the Natural World See More Popular See More More Commonly Mispronounced Words The Longest Long Words List 9 Other Words for Beautiful See More Games & Quizzes See All Quordle Can you solve 4 words at once? Play Blossom Pick the best words! Play The Missing Letter A daily crossword with a twist Play Name That Tree! A quiz that’s all bark, no bite. Take the quiz See All