词根词缀：di-, dicho-, dich-

【来源及含义】Greek: number two; twice, divided, double; unalike; a number used as a prefix

【同源单词】diacanthous, diacid, diadelphous, dianthous, diarch, diarchy

词根词缀：-ism, -ismus

【来源及含义】Greek, ismos; Latin, ismus: a suffix: belief in, practice of, condition of, process, characteristic behavior or manner, abnormal state, distinctive feature or trait

【同源单词】abaptism, abolitionism, abortionism, abrakophilism, absenteeism, absolutism

词根词缀：plano-, plan-, -plany, -plania

【来源及含义】Greek: passively drifting, wandering, or roaming; planet or planets

【相关描述】The planets are shown in this unit with images and links for details about each planet.

【相关词根词缀】 A cross reference of word units that are related, directly or indirectly, to the: "moon": Calendar, Moon Facts; Chemical Element: selenium; Gods and Goddesses; luna, luni-; Luna, the earth moon; menisc-; meno-; Planets in Motion; seleno-.

【同源单词】angioplany, aplanogamete, diplanetism, exoplanet, extrasolar planet, interplanetary