atto-

Etymology

From Danish atten (“eighteen”), extending the idea to how femto- is derived from Danish femten (“fifteen”) and the fermi unit.

Prefix

atto-

1. In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁻¹⁸ (short scale quintillionth or long scale trillionth). Symbol: a

Anagrams

• to a T, toat, tota

Etymology

Borrowed from Danish atten (“eighteen”).

Prefix

atto-

1. atto-

Further reading

• “atto-” in Diccionari de la llengua catalana, segona edició, Institut d’Estudis Catalans.
• “atto-”, in Gran Diccionari de la Llengua Catalana, Grup Enciclopèdia Catalana, 2025.
• “atto-” in Diccionari normatiu valencià, Acadèmia Valenciana de la Llengua.

Etymology

From atten (“eighteen”).

Prefix

atto-

1. atto-

Etymology

From Danish atten (“eighteen”).

Pronunciation

• IPA^(key): /ˈɑ.toː/

• Audio:

  (file)

Prefix

atto-

1. atto-

Etymology

Internationalism (see English atto-).

Pronunciation

• IPA^(key): /ˈɑtːo-/, [ˈɑ̝t̪ːo̞-]

Prefix

atto-

1. atto-

Further reading

• “atto-”, in Kielitoimiston sanakirja [Dictionary of Contemporary Finnish]‎ (in Finnish) (online dictionary, continuously updated), Kotimaisten kielten keskuksen verkkojulkaisuja 35, Helsinki: Kotimaisten kielten tutkimuskeskus (Institute for the Languages of Finland), 2004–, retrieved 2023-07-02

Anagrams

• otat, taot, tota

Pronunciation

• Audio:

  (file)

Prefix

atto-

1. atto-

Etymology

Derived from Danish atten.

Pronunciation

• IPA^(key): /at.tɔ/

• Audio:

  (file)

• Rhymes: -attɔ
• Syllabification: [please specify syllabification manually]

Prefix

atto-

1. atto-

   ‎atto- + ‎sekunda → ‎attosekunda

Further reading

• atto- in Polish dictionaries at PWN

Etymology

Borrowed from Danish atten (“eighteen”).

Pronunciation

• IPA^(key): /ˈadto/ [ˈað̞.t̪o]
• Rhymes: -adto

Prefix

atto-

1. atto-

Further reading

• “atto-”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8, Royal Spanish Academy [Spanish: Real Academia Española], 2024 December 10