Here is the requested information on "arcus":
1. Parts of Speech: Noun
2. Definitions:
- A low, horizontal cloud formation often associated with thunderstorms (source: [Merriam-Webster](https://www.merriam-webster.com/dictionary/arcus))
- A band of fibrous tissue that connects two parts of the body, especially the arch of the foot (source: [Oxford Languages](https://languages.oup.com/definition/arcus/?view=uk))
3. Pronunciations:
- US: /ˈɑrkəs/
- UK: /ˈɑːkəs/ (source: [Oxford Languages](https://languages.oup.com/definition/arcus/?view=uk))
4. Origin and Usage:
- The word "arcus" has Latin roots, meaning "bow" or "arch". It is used in meteorology to describe a type of cloud formation that appears as a low, horizontal shelf-like cloud, typically associated with thunderstorms. It can also refer to a fibrous tissue that connects two parts of the body, most commonly the arch of the foot.
5. Synonyms:
- For the meteorological definition: shelf cloud, roll cloud, thunderstorm cloud (source: [The Weather Channel](https://weather.com/science/weather-explainers/news/2019-05-17-what-is-an-arcus-cloud-shelf-cloud-thunderstorm))
- For the anatomical definition: plantar fascia (source: [WebMD](https://www.webmd.com/pain-management/plantar-fasciitis))
6. Related Words:
- carus, scaur, scuba (source: [WordFinder](https://www.wordfinder.com/ends-with/arcus/5-letter-words/))
7. Example Sentences:
- The ominous arcus cloud on the horizon signaled an approaching thunderstorm.
- The podiatrist diagnosed her with plantar fasciitis, a condition caused by inflammation of the arcus tissue in the foot.