(mathematics) A cycle, in a graph, that has no cycle chord

Alternative spelling of cubbyhole

plural of toad in the hole

(engineering) A hole drilled into the ground for oil or gas exploration which fails to yield enough oil or gas to justify the establishment of a well.

(physics) A vacant position in the atomic lattice of a conductor where an electron would normally be present

(slang) The state of dissociation from (and lack of control over) the body commonly experienced after taking relatively high doses of the drug ketamine.

(chiefly Australia, New Zealand) An area for swimming in a stream or river.

(astrophysics) A region in the corona of a star where magnetic field lines extend out into space, allowing solar wind to escape.

A saw in the form of a hollow cylinder with teeth on the end or edge, used to produce holes on the workpiece and operated by rotation, often as an accessory to a power drill.

(anatomy, slang, vulgar) vagina / (anatomy, slang, vulgar, gay culture) anus