Radicals vs Components

In the previous lesson you learned about radicals (部首ぶしゅ) classification labels used to classify and look up kanji, not the literal building blocks. The real building blocks are components (the visual pieces a character is made of). Here we clarify the difference between the dictionary radical (one per kanji, for lookup) and visual components (the stroke-path pieces). KanjiVG provides one marked dictionary radical (kvg:radical) and multiple stroke-path components; it does not define components by meaning only by how the strokes are grouped visually.

Understanding this distinction helps you use dictionaries correctly and see how complex kanji are built from smaller, reusable parts.

The Dictionary Radical (One Per Kanji)

Each kanji is assigned exactly one dictionary radical for lookup. That radical is chosen by convention (often the part that hints at meaning or the “main” component). KanjiVG marks this with a kvg:radical attribute on one group of strokes. The value may be “general” (modern standard assignment) or “tradit” (traditional Kangxi assignment). When you look up a kanji by radical, you use this one part.

Components: Visual Building Blocks

KanjiVG also decomposes each character into stroke-path components: groups of strokes (sometimes nested the dictionary radical can be a subset of strokes within a component, not always a whole “top-level” piece). For example, 安あん (safe, cheap) is drawn as a roof 宀うかんむり on top and 女おんな (woman) below. So we get two components (宀 and 女), but the dictionary radical for 安 is 女. Many learners expect 宀 to be the radical because it’s the “roof”; dictionary convention, however, assigns 女 for 安, so that’s the part used for lookup.

In other kanji, the dictionary radical may match one component, or be a smaller part inside a component. Either way: dictionary radical = the one part used for classification and lookup; components = how the character is drawn from visual pieces.

See It in KanjiVG

Below, each card loads data from KanjiVG for one kanji. You see the dictionary radical and the components (the visual pieces). Position labels (e.g. “left”, “right”, “top”) are added by this app from the layout of the parts KanjiVG itself does not provide them. Meanings come from our radical dictionary.

Takeaway

• Dictionary radical = the one part used to look up the kanji in a radical index.
• Components = the stroke-path pieces that build the character (sometimes nested; the dictionary radical may be a subset of strokes within a component).
• The dictionary radical is often one of the components, but not always; sometimes it’s a subset of strokes.
• In the app, when you open a kanji’s details, we show both: the dictionary radical and the full component breakdown.