词根：-vac-, -vacu-, -van-, -void-

【词根含义】：空

【词根来源】：-vac-来源于拉丁语动词vac.o, vac.are, vac.avi, vac.atum(空);-vacu-来源于拉丁语动词vacuo, -are, -avi, -atus(使空); -van-来源于拉丁语形容词van.us, van.a, van.um(空);-void-来源于古法语vuide(空的)。均可追溯至原始印欧语wan-(缺乏的)。

【同源单词】：vacancy, vacant, vacate, vacation, vacationist

前缀：e-, ex-

【词根含义】：出,向外;向上

【词根来源】：e-用在b, c, d, g, j, l, m, n, r, v前;ex-用在s前时,s常省略。来源于拉丁语前缀ex-。

【同源单词】：edit, edition, editor, editorial, educate

词根词缀：-ish

【来源及含义】Old English: a suffix meaning, characteristic of, like, tending to; of or relating to, from; somewhat, approximately; or a verb ending

【相关描述】A suffix used to form adjectives from nouns and from adjectives. It refers to "relation, resemblance, similarity", and sometimes has a diminutive force; such as, "selfish, boyish, brutish; whitish, somewhat white".

A verb ending, originally appearing in certain verbs of French origin; such as, "abolish, cherish, finish, furnish, garnish", and "impoverish".

【同源单词】abolish, accomplish, acutish, admonish, anguish, anguish

词根词缀：vane-, vani-

【来源及含义】Latin: to vanish, to disappear, to fade, to become empty

【同源单词】evanescent, evanish, vain, vainglorious, vaingloriously, vaingloriousness