xenna-
prefix/ˈzɛnə/
Etymology From Ancient Greek ἐννέα (ennéa, “nine”), for the ninth order of 10³, and the letter x, as the third term in a series running backwards through the alphabet (after zetta- and yotta-). The final a conforms to the final vowel of the SI series from mega- upwards.
1
Informal, Morpheme Synonym of ronna- (used before an official prefix existed). Symbol: X
- The SI prefixes above are not the only extreme ones. Others such as xenno (x) (10⁻²⁷) and xenna (X) (10²⁷), or vendeko (v) (10⁻³³) and vendeka (V) (10³³) exist, and can help simplify the expression of extreme numbers.1994, IPC Magazines, New Scientist, volume 144, page 81:
- If we try to calculate the mass of earth it comes to 6 xennagrams which is nothing but 6x10²⁴ kilograms or 6x10²⁷ gms.1997, Council of Scientific & Industrial Research, Science Reporter, volume 34, page 23:
1 more example
- But that's nothing: our universe is about 0.8 Xm (Xennametres, billions of billions of billions of metres) in diameter.2015, Claude Phipps, No Wonder You Wonder!: Great Inventions and Scientific Mysteries, Springer, page 62:
- Antonyms
- xenno-