atto-

Fetched 2026-10-26 (cache).

Synonyms: attor, atto, auto-, atmo-, alto-, atlo-

Antonyms: attor, atto, auto-, atmo-, alto-, atlo-

Related words from Datamuse; suggestions, not definitions.

Prefix

1. {{senseid|en|Q110817}} 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]]).

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.