Spiral
/spˈaɪrəl/
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Definition
(noun) A curve that is the locus of a point that rotates about a fixed point while continuously increasing its distance from that point.
Sentence Examples
A snail's shell is spiral in form.
A spiral staircase leads onto the gallery of the church.
CEFR Practice Quiz
The shell of the snail forms a perfect ____ that grows larger as the small animal gets older.