plural of hard R

(meteorology) A freeze sufficiently long and severe to destroy seasonal vegetation and lead to ice formation in standing water and hard ground. 27°F (-3°C) is considered a threshold in the US.

(cinematography) A technique where the top and bottom of the film frame are masked off in camera, as opposed to soft matte.

(computer hardware) One of a series of parallel magnetic recording disks in a drive unit, used for the recording and retrieval of digital information; used especially in personal computers.

guided by practical experience and observation rather than by theory / (idiomatic) hardheaded, stubborn / (of a person) tough and relentlessly practical and thus not given to sentiment.

A printed copy of a digital document, as opposed to a copy in electronic form.

(idiomatic) Having difficulty hearing; somewhat deaf.

(of a boiled egg) Cooked to a solid consistency. / (of a person, especially a detective) Callous and unsentimental.

simple past tense and past participle of hard-boil

(chemistry) Water with a high concentration of dissolved minerals, especially calcium, making it difficult to lather with soap.