词根词缀：penna-

【来源及含义】Latin: feather, feathers; by extension in some situations, wing, wings

【相关词根词缀】 Related "feather, feather-like; soft down, plumage" word units: pinni-, pin-; plum-, -plume; pterido-; ptero-; ptilo-.

【同源单词】bipennate muscle, bipennate, brevipennate, empennage, impennate, longipennate

词根词缀：plano-, plan-, plani-

【来源及含义】Latin: flat, even, level, smooth

【同源单词】explain, explainable, explainer, explanation, explanatory, pedoplania