conoid

If the axis is perpendicular to the directrix plane, the conoid is called a right conoid (Gray et al.

I could probably guess what a conoid is, but I don't actually know (until reading these comments).

> noun a conoid object: her hull was a conoid, tapering towards the bow.

> A conoid is a ruled surface whose rulings are parallel to a plane (called the directrix plane) and intersect a fixed line (called the axis of the conoid) (Gellert et al.

Sure, but you can imagine pretty easily what a ‘conoid’ would be, right?

‘Sphereoid’ would be something sphere-like, ‘mongoloid’ is something mongol-like, ‘freakazoid’ is something freaky… it’s pretty clear from context that ‘conoid’ means ‘like a cone’ isn’t it?

What did the captcha think was a conoid...?

Examples include the circular conoid, helicoid, hyperbolic paraboloid, parabolic conoid, Plücker conoid, right circular conoid, Wallis's conical edge, Whitney umbrella, and Zindler conoid.

So I guess a crosswalk (flat rectangle in 3D space), would be considered a 'ruled surface', but I don't think it meets the other requirement to make it a conoid.

I can't be the only person who's been checking as many wrong answers as I can get away with for the last decade, and I'd be complimented by my conoid-questioning brethren.

The Wikipedia panel says "In geometry a conoid is a ruled surface, whose rulings fulfill the additional conditions: All rulings are parallel to a plane, the directrix plane.

Google "conoid" and you'll get a bunch of pictures of shapes that are curved in different ways.

But on the internet the answer to „what is a conoid“ is just a web search away.

I am Googling "conoid" right now and I still can't even imagine what it's supposed to be.