词根词缀：atto-

【来源及含义】Danish or Norwegian: eighteen; a decimal prefix used in the international metric system for measurements

【相关描述】This prefix is used in the metric [decimal] system as quintillionth [U.S.] and trillionth part [U.K.], 10^-18 [0.000 000 000 000 000 001]. The metric symbol for atto- is a.

【相关词根词缀】 Related "metric" families: yotta; zetta; exa; peta; tera; giga; mega; kilo; hecto; deka; deci; centi; milli; micro; nano; pico; femto; zepto; yocto.

【同源单词】attoampere, attofarad, attogram, attoscience, attosecond, attotesla

词根词缀：pico-

【来源及含义】Italian: very small or from Spanish, "beak, tip, very small"; and from Latin, beccus, beak; also, a decimal prefix used in the international metric system for measurements

【相关描述】This prefix is used in metric [decimal] system as trillionth [U.S.] and billionth part [U.K.], 10^-12 [0.000 000 000 001]. The metric symbol for pico- is p.

【相关词根词缀】 Related "metric" families: yotta; zetta; exa; peta; tera; giga; mega; kilo; hecto; deka; deci; centi; milli; micro; nano; femto; atto; zepto; yocto.

【同源单词】picoammeter, picoampere, picocurie, picofarad, picogram, picokelvin