词根：-em-, -empt-, -sum-, -sumpt-

【词根含义】：拿,买

【词根来源】：-em-, -empt-, -sum-, -sumpt-(拿,买)来源于拉丁语动词emo, emere, emi, emptus(拿,买)和sumo, sumere, sumpsi, sumptus(拿,买);而sumere是由sub-(下,低)和emere(拿,买)组成的复合动词。

【同源单词】：example, exemplar, exemplary, exemplify, redeem

前缀：pre-

【词根含义】：前,先

【词根来源】：来源于拉丁语prae。

【同源单词】：precaution, precede, precedent, preceding, precise

词根词缀：em-, emp-, empt-; sump-, -sum-

【来源及含义】Latin: a taking, to take, to take up, to buy, to select; to use, to spend, to consume

【同源单词】absumption, assume, assumed, assumer, assuming, assumpsit

词根词缀：-ous, -ious, -eous

【来源及含义】Latin: full of or having the qualities of; in chemistry, a suffix denoting that the element indicated by the name bearing it, has a valence lower than that denoted by the termination -ic; as, nitrous, sulphurous, etc., as contrasted with nitric, sulphuric, etc.

【相关描述】Only a small number of the hundreds of examples are presented because there are just too many to include at this time.

【同源单词】abdominous, abiogenous, ablepharous, abstemious, acanthaceous, acanthocephalous

词根词缀：pre-, prae-

【来源及含义】Latin: before [both in time and place]

【相关描述】The prefix prae- can actually be substituted for pre- because both of them are different spellings for the same prefix meaning "before".

【相关词根词缀】 Related before-word units: ante-; antero-; anti-; pro-. Related "time" units: aevum, evum; archaeo-, archeo-; Calendars; chrono-; horo-; Quotes: Time; tempo-.

【同源单词】preacquaint, preacquaintance, preagonal, pre-agricultural, preamble, preambular