Reference > Roget’s > International Thesaurus > 323. Hardness.
Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.
Class III. Words Relating to Matter
Section II. Inorganic Matter
1. Solid Matter
323. Hardness.
NOUN:HARDNESS &c. adj.; rigidity; renitency or renitence; inflexibility, temper, callosity, durity [obs.].
  INDURATION, petrifaction; lapidification, lapidescence [rare]; cornification, chondrification, vitrification, vitrescence, ossification; crystallization.
  [COMPARISONS] stone, pebble, flint, marble, rock, fossil, crag, crystal, quartz, granite, adamant; bone, cartilage; calculus; hardware; heart of oak, block, board, deal board; iron, steel; cast -, decarbonized -, wrought- iron; nail; brick, concrete; cement; osmiridium, iridosmine or iridosmium.
VERB:HARDEN; render hard &c. adj.; stiffen, indurate, petrify, temper, ossify, vitrify, lithify, lapidify, cement.
ADJECTIVE:HARD, rigid, stubborn, stiff, firm; starch, starched; stark, unbending, unlimber, renitent, unyielding; inflexible, tense; indurate, indurated; gritty, proof.
  adamantine, adamantean; concrete, stony, rocky, granitic, calculous, lithic, vitrescent, vitrifiable, vitrescible, vitreous; horny, cornified, callous, corneous; bony, ossipid, osseous, ossific; cartilaginous; lapideous, lapidific or lapidifical [rare]; crystallized, crystalloid; hard as a -stone &c. n.; stiff as -buckram, - a poker.



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