hardness
hardness is defined in Webster's Unabridged Dictionary (1913) with 2 senses, and appears in Roget's Thesaurus (1911) with 40 related terms. The full text of each entry is reproduced verbatim below.
Definitions
- 1.(Min.) The cohesion of the particles on the surface of a body, determined by its capacity to scratch another, or be itself scratched;-measured among minerals on a scale of which diamond and talc form the extremes.
- 2.(Chem.) The peculiar quality exhibited by water which has mineral salts dissolved in it. Such water forms an insoluble compound with soap, and is hence unfit for washing purposes. Note: This quality is caused by the presence of calcium carbonate, causing temporary hardness which can be removed by boiling, or by calcium sulphate, causing permanent hardness which can not be so removed, but may be improved by the addition of sodium carbonate.
Source: Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
Synonyms
Related terms (Roget's 1911)
- adamant
- adamantean
- adamantine
- adder
- and
- beetle
- benefit
- block
- board
- bone
- bony
- brick
- buckram
- calculous
- callosity
- cartilage
- cartilaginous
- cast
- cement
- clergy
- close
- concrete
- conscience
- contrition
- corneous
- crag
- crystal
- crystallization
- deaf
- deaf-mute
- deafen
- deafness
- deal
- die
- dull
- durity
- ear
- earless
- evil
- firm
Source: Roget's Thesaurus, 1911 edition (public domain, via Project Gutenberg eBook #10681).
Related questions
Sources
- Definitions: Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
- Synonyms & antonyms: Roget's Thesaurus, 1911 edition (public domain, via Project Gutenberg eBook #10681).
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