词根词缀：femto-

【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：hebe-, heb-

【来源及含义】Greek: youth, pubescence, puberty [the period during which the secondary characteristics of maturity begin to develop; by extension, a young man]

【相关描述】At the end of the first year the ephebians gave a display of their skill in military tactics and drills before the citizens of Athens in the state theater. At the close of this display each ephebian received a spear and a shield and took his oath of allegiance.

【同源单词】ephebe, ephebian, ephebiatrics, ephebic, ephebology, ephebus

词根词缀：peta-

【来源及含义】Greek: derived from penta-, "five"; a decimal prefix used in the international metric system for measurements

【相关描述】Used in the metric [decimal] system as one quadrillion [U.S.] or thousand billionfold [U.K.], 10¹⁵ [1 000 000 000 000 000] The metric symbol for peta- is P.

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

【同源单词】petabecquerel, petabyte, petaflop, petaflops, petagram, petahertz