ideo- [GK] = idea 思想，概念

ideogram n. 表意文字或符号 [-gram = sth. written] 

ideology n. 思想体系；思想意识 [-logy = the science of] 

ideomotor a. [心](观）念（运）动的 [mot = to move]

infra- [L] = below, under 在…下；beyond 在…外 

infrahuman a. 低于人类的；类人猿的 

infrastructure n. 基础结构；底层结构 

infrasonic a. [物]亚声的，次声的 

infrared a. [物]红外线的；红外区的

intra- [L] = within 在内；inside 在内部 

intramural a. (国家、团体等）内部的 [mur = wall] 

intravenous a. 静脉内的；静脉注射的 [ ven = vein] 

intracity a. 城市内部的 

intraparty a. 党内的

intro- [L] = within 在内;inward 进内 

introduce v. 引进；介绍 [duc = to lead] 

introspect v. 内省；反省 [spect=to look] 

introvert v. 使内弯，使内翻 [vert =to turn] 

iso- [GK] = equal 等;alike 同

isobar n. [气]等压线 [bar = weight] 

isothermal a. 等温的 [therm = heat] 

isogenous a. [生]同源的 [gen = kind, race] 

isomorph n. [化]同晶体形[-morph = form]

karyo- [GK] =cell nucleus 核

karyogamy n. [生]核配（合） [-gamy = joint]

karyokinesis n. [生]核分裂      [kinesis = motion]

karyoplasm n. [生]核质 [-plasm= sth. moulded]