Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 adjective Shaped like a cone.
from The Century Dictionary.
 In conchology, resembling or having the characters of the Conidæ.
 noun A gastropod of the family Conidæ.
 Having the form of a cone; conoidal.
 noun In geometry: A solid formed by the revolution of a conic section about its axis. A skew surface which may be generated by a straight line moving in such a manner as to touch a straight line and curve, and continue parallel to a given plane. A surface generated by the revolution of an arc of a circle about its sine.
 noun In anatomy, the conarium or pineal body.
from the GNU version of the Collaborative International Dictionary of English.
 adjective Resembling a cone; conoidal.
 noun Anything that has a form resembling that of a cone.
 noun A solid formed by the revolution of a conic section about its axis; ;  more commonly called
paraboloid ,ellipsoid , etc.  noun A surface which may be generated by a straight line moving in such a manner as always to meet a given straight line and a given curve, and continue parallel to a given plane.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 adjective Shaped like a
cone ;conical  adjective geometry A Catalan surface all of whose rulings intersect some fixed line.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 noun a shape whose base is a circle and whose sides taper up to a point
Etymologies
from Wiktionary, Creative Commons Attribution/ShareAlike License
Examples

That the center of gravity of a segment of a right conoid which is cut off by a plane perpendicular to the axis, lies on the straight line which is the axis of the segment divided in such a way that the portion at the vertex is twice as great as the remainder, may be perceived by our method in the following way:
Geometrical Solutions Derived from Mechanics; a Treatise of Archimedes

That the center of gravity of a segment of a right conoid which is cut off by a plane perpendicular to the axis, lies on the straight line which is the axis of the segment divided in such a way that the portion at the vertex is twice as great as the remainder, may be perceived by our method in the following way:
Geometrical Solutions Derived from Mechanics; a Treatise of Archimedes

That the center of gravity of a segment of a right conoid which is cut off by a plane perpendicular to the axis, lies on the straight line which is the axis of the segment divided in such a way that the portion at the vertex is twice as great as the remainder, may be perceived by our method in the following way:
Geometrical Solutions Derived from Mechanics; a Treatise of Archimedes

Dazedly he saw a crimson conoid cloud spinning up and over the mountain slopes.

Down the mountainslopes, like a whorl of shining dust blown before the wind, a crimson, conoid cloud came dancing.

The Hindus I believe to have been the first who symbolised by an equilateral triangle their peculiar cult, the YoniLinga: in their temple architecture, it became either a conoid or a perfect pyramid.

The only large building is the Jami or Cathedral, a long barn of povertystricken appearance, with brokendown gates, and two whitewashed minarets of truncated conoid shape.

Down the mountainslopes, like a whorl of shining dust blown before the wind, a crimson, conoid cloud came dancing.

On these heights, which are mostly conoid with rounded tops, joined by ridges and saddlebacks, various kinds of Acacia cast a pallid and sickly green, like the olive tree upon the hills of Provence.

Frequent anthills gave an appearance of habitation to a desert still covered with the mosques and tombs of old Adel; and the shape of the country had gradually changed, basins and broad slopes now replacing the thickly crowded conoid peaks of the lower regions.
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