[fak-yuh-luh] /ˈfæk yə lə/
noun, plural faculae
[fak-yuh-lee] /ˈfæk yəˌli/ (Show IPA). Astronomy.
an irregular, unusually bright patch on the sun’s surface.
noun (pl) -lae (-ˌliː)
any of the bright areas on the sun’s surface, usually appearing just before a sunspot and subject to the same 11-year cycle
Plural faculae (fāk’yə-lē’)
A bright, cloudlike structure on the Sun’s surface, ascending several hundred kilometers above the photosphere and often associated with sunspots. Faculae are formed when a strong magnetic field heats a region of the photosphere to higher temperatures than the surrounding area. They occur all over the Sun but are usually only visible near the limb (the outer edge of the Sun’s apparent disk), where the photosphere appears dimmer than in the center.
[fak-uh l-tey-tiv] /ˈfæk əlˌteɪ tɪv/ adjective 1. conferring a faculty, privilege, permission, or the power of doing or not doing something: a facultative enactment. 2. left to one’s option or choice; optional: The last questions in the examination were facultative. 3. that may or may not take place; that may or may not assume a […]
- Facultative anaerobe
facultative anaerobe n. An organism, such as a bacterium, that can live in the absence as well as in the presence of atmospheric oxygen.
noun, Botany. 1. a plant that can reproduce sexually or asexually.
- Facultative hyperopia
facultative hyperopia n. Manifest hyperopia that can be overcome by an effort of accommodation.