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1. Mathematics
a. A surface generated by a closed curve rotating about, but not intersecting or containing, an axis in its own plane.
b. A solid having such a surface.
2. A body having the shape of a toroid.

to·roi′dal (tô-roid′l) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Mathematics) geometry a surface generated by rotating a closed plane curve about a coplanar line that does not intersect the curve
2. (Mathematics) the solid enclosed by such a surface. See also torus
toˈroidal adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈtɔr ɔɪd, ˈtoʊr-)

1. a surface generated by the revolution of any closed plane curve or contour about an axis lying in its plane.
2. the solid enclosed by such a surface.
[1895–1900; tor (us) + -oid]
to•roi′dal, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.toroid - the doughnut-shaped object enclosed by a torus
solid - a three-dimensional shape
anchor ring, annulus, doughnut, halo, ring - a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke"
2.toroid - a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circletoroid - a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle
magnetic core, core - (computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories; "each core has three wires passing through it, providing the means to select and detect the contents of each bit"
round shape - a shape that is curved and without sharp angles
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
It is made up of two primary geometrical shapes: a cylinder representing the cup, and an elliptic toroid representing the handle.
The current units are widely adjustable to support [+ or -]20-mA or 0- to 20-mA DC inputs and 0- to 20-A AC signals with a toroid sensor.
In a toroidal solenoid, any magnetic flux is confined within the toroid. This feature is consistent with the idea that the mass of a particle matches the electromagnetic energy contained therein.
DNA condensation by protamine and arginine-rich peptides and analysis of toroid stability using single DNA molecules.
The mixer, retaining a toroid shape and featuring 24 holes in its inner surface, is located in between the throttle valve and the intake manifold.
To ensure each TX with the predetermined amplitude and phase of feeding voltage, a lumped transformer with a Mn-Zn-type toroid ferrite core is used to deliver the power of one channel coming from the source into several channels feeding to multiple TXs.
Caption: Figure 4: Magneto-optical hysteresis loops (a) and domain patterns (b) of the coiled BL-FC ribbon (toroid, 13 mm in diameter).
However, it is important to note that after a long period of incubation these amines induce rod and toroid structured polymers of DNA whereas prion protein induces ordered globular aggregates of DNA molecules [42, 47].
The coefficients [A.sub.z] and [A.sub.y] consider the inhomogeneity of the distribution of the fluid density in the toroid channel and related linear acceleration sensor sensitivity.
For the authors, that structure resembled a toroid and appeared to be involved in the lipid droplet (LD) assembly organization [49].
Finally, we had a toroid core, Figure 5d, that was split in half, with windings on each side.
In the ISN Super-MSS[TM] Sendust (MS) choke structure, an alloy-powder material of the toroid core RTMSS material was used.