A statistical Markov model in which the system being modelled is assumed to be a Markov process with unobserved (hidden) states.

plural of hickory nut

One of the large edible nuts of the hickory tree.

Synonym of hide the sausage

past participle of hide away

(aviation) A connecting city between the origin and destination of a passenger flight, where a passenger can save money on the airfare by disembarking at the connecting city rather than continuing to the destination.

plural of hidden city

(computing, Internet) Deep Web

Rare form of doohickey.

(baseball) A fielding play where the fielders deceive the baserunners as to the location of the ball, allowing one of the fielders to attempt to tag a runner out without the runner being aware of it.