The Collaborative International Dictionary
Truncated \Trun"ca*ted\, a.
Cut off; cut short; maimed.
(Min.) Replaced, or cut off, by a plane, especially when equally inclined to the adjoining faces; as, a truncated edge.
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(Zo["o]l.) Lacking the apex; -- said of certain spiral shells in which the apex naturally drops off.
Truncated cone or Truncated pyramid (Geom.), a cone or pyramid whose vertex is cut off by a plane, the plane being usually parallel to the base.
WordNet
n. a frustum formed from a cone
Wikipedia
Usage examples of "truncated cone".
It was explored thus to the very summit of the truncated cone terminating the first row of rocks, then to the upper ridge of the enormous hat, at the bottom of which opened the crater.
As the ring grew in height it naturally spread out into a broad, truncated cone with a central pit gouged out of its top, with the spitting fissure in the bottom of that pit.
The truncated cone sat in a puddle of yellow inflatable skirts, in the middle of a grassy meadow.
He waded to the truncated cone and climbed up onto it, then sat cross-legged, hugging his arms to his chest for warmth.
It was a truncated cone, shaped much like its little brothers, the Phoenix variations that had served between Earth and moon for fifty years.
It had the general outlines of a Puritan-hat, a Pilgrimish number consisting of a truncated cone mounted on a broad flat brim, but enlivened with colorful bands, trailing ribbons, jeweled badges, curious feathers, and other merchandise—.
Deep, velcroed chairs surrounded a terminal that was a low, truncated cone.
Actually it was the base of a shallow, truncated cone that floated free within the station's huba little space station in its own right.
The shell was a definite truncated cone now, tumbling with slow solemnity as it passed along among the stars.
Greg stood waiting for him, leaning one-armed against the huge truncated cone, grinning like a proud papa.