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spiral British & World English

Winding in a continuous and gradually widening (or tightening) curve, either around a central point on a flat plane or about an axis so as to form a cone

spiral English Thesaurus

a spiral column of smoke

Airy spiral British & World English

Each of the spirals of light that are visible when polarized light which has been passed through two plates of left-handed and right-handed quartz is viewed through crossed Nicol prisms.

death spiral British & World English

A spiralling downward path taken by an aircraft that is out of control

spiral-bound British & World English

(Of a book or notepad) bound with a wire or plastic spiral threaded through a row of holes along one edge

spiral galaxy British & World English

A galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms

genetic spiral British & World English

The line joining successive points of insertion in a spiral pattern of phyllotaxis.

musculo-spiral British & World English

Designating a branch of the brachial plexus that winds around the humerus to supply muscles and skin of the arm and forearm (now known as the radial nerve); of, relating to, or associated with this nerve.

Margulies spiral British & World English

A spiral-shaped intrauterine contraceptive device, made of plastic.

reciprocal spiral British & World English

A spiral in which the length of the radius vector is inversely proportional to the angle through which it is turned.

equiangular spiral British & World English

A spiral such that the angle between the tangent and the radius vector is the same for all points of the spiral

logarithmic spiral British & World English

Another term for equiangular spiral.

spiral down/downward in spiral British & World English

Decrease or deteriorate continuously