词根词缀：atto- [A toh]

【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：femto- [FEM toh]

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

【相关描述】It is used in the metric [decimal] system as quadrillionth [U.S.] and thousand-billionth part [U.K.], 10^-15 [0.000 000 000 000 001]. The metric symbol for femto- is f.

【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; atto; zepto; yocto.

【同源单词】femtoampere, femtogram, femtojoule, femtoliter, femtometer, femtomole

词根词缀：hecto- [HEK toh], hect-, hecato-, hecaton-, hekto-, hekt-

【来源及含义】Greek: a hundred; many; a decimal prefix used in the international metric system for measurements

【相关描述】In the metric [decimal] system, hecto- is used to show whole units; a hundred [U.S.] and hundredfold [U.K.], 10 [100]. The metric symbol for hecto- is h.

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

【同源单词】hecatophyllous, hectare, hectogram, hectograph, hectoliter, hectometer

词根词缀：zepto- [ZEP toh]

【来源及含义】Latin: septo-, seven; a decimal prefix [10^-21] used in the international metric system for measurements

【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; atto; yocto.

【同源单词】zeptomole, zeptosecond, zeptowatt