螺旋|らせんrasen[0]heiban (flat)

1. nounspiral; helix
2. nounscrew

• Synonym渦巻きうずまきNeutralA whirlpool in water or a swirl pattern; 「螺旋」 is the coiled shape itself, flat or three-dimensional, as in 「螺旋階段」.
• SynonymスパイラルNeutralLoanword for a spiral shape; also often used figuratively for a vicious cycle, as in 「デフレスパイラル」.
• SynonymネジNeutralA screw or bolt, also the spring of a clock or watch; usually written 「ネジ」. A concrete part, not a shape.
• Synonym螺線らせんWrittenWritten term for a spiral line, such as a vine coiling around a cylinder; in everyday writing 「螺旋」 is the usual choice.
• Synonym渦状かじょうWrittenWritten term meaning spiral-shaped, used mostly as a modifier before a noun, as in 「渦状星雲」; in everyday speech 「渦巻き状」 is used.
• Related渦うずNeutralA whirlpool of water or air, also figuratively a chaotic situation; 「螺旋」 is a shape and does not refer to fluid.
• RelatedカールNeutralCurling of the hair, also an arm exercise; only for hair and the like, never for spiral shapes in general.
• RelatedロールNeutralSomething rolled up, such as a bread roll or a roller; it is wound into a tube, not a spiral line.
• Related渦紋かもんWrittenWritten term for a whirlpool design, used mainly in art and archaeology; in daily life 「渦巻き模様」 is said.
• Related渦巻き形うずまきがたNeutralA swirl shape, mostly flat and two-dimensional; 「螺旋」 can also describe a three-dimensional coil rising as it turns.
• Related渦状文かじょうもんWrittenArchaeology and art term for spiral ornamentation on pottery and the like; not used in everyday speech.

Use 「螺旋」 for a shape that coils or winds upward, as in 「螺旋階段」. For whirlpools and swirl patterns use 「渦巻き」, for a vicious-cycle metaphor 「スパイラル」, and for the screw as a part 「ネジ」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 曲線きょくせんの形状けいじょう。巻き貝まきがい（螺ら）の殻からのように旋回せんかいしていること。また、そのようなもの。三さん次元じげん空間くうかんにおいて、回転かいてんしながら回転かいてん面めんに垂直すいちょく成分せいぶんのある方向ほうこうへ移動いどう（上昇じょうしょうまたは下降かこう）する点てんの軌跡きせき。
2. 曲線きょくせんの形状けいじょう。二次元にじげん平面へいめんにおける、渦巻うずまきの別称べっしょう。
3. ねじ。