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hardness ['hɑ:dnɪs] adj.
med.	صَلابَة؛ قَسَاوَة
rem.sens.	صَلاَدة
total hardness ['hɑ:dnɪs] adj.
water.suppl.	عٌسْر كلي
hardness Resistance of a solid to indentation, scratching, abrasion or cutting ['hɑ:dnɪs] adj.
environ.	صلابة
English thesaurus
hardness ['hɑ:dnɪs] abbr.
abbr.	hdns
jewl.	см. Mohs Scale of Hardness

hardness : 8 phrases in 4 subjects

Environment	1
Forestry	1
Oil / petroleum	4
Water supply	2