词根词缀：gram-, -gram-, -gram, -grammatic, -grammatical, -grammatically, -gramme, -grammic
【来源及含义】Greek: write, writing, something written, a written record, a recording; letters; words; later, a small weight, a unit of mass in the metric system
【相关描述】A unit of weight in the metric system from 1797 gramme, borrowing of French gramme, from Late Latin gramma, "small weight"; from Greek gramma, "small weight"; originally, "something written"; from the stem of graphein, "to draw, to write".
【相关词根词缀】Related "writing" word units: glypto-; graph-; scrib-, script-.
【同源单词】accelerogram, achillogram, acoustogram, acrogram, acronym, actinogram
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