conoid

adj

1. Shaped like a cone; conical.

   “The rebuilding of Oxford Road Station, Manchester […] is progressing steadily, and the conoid roof has recently been erected.”

   “Historic England explained the listing: "The station's unique design employs a high level of sophistication and innovation through its use of conoid shells supported on a cruck-like frame, which not only create a dramatic aesthetic form, but endow the building with a light and spacious interior."”

noun

1. Anything shaped like a cone.

   “The concourse is roofed with three conoids, ranging in width from 97 ft. 3 in. maximum to 41 ft. 6 in. minimum.”

2. A Catalan surface all of whose rulings intersect some fixed line
3. A solid formed by the revolution of a conic section about its axis

   “A parabolic conoid is a paraboloid; an elliptic conoid is an ellipsoid.”

4. The pineal gland