SECTION II. INORGANIC MATTER
Density –N. solidity; solidness; impenetrability, impermeability; incompressibility; imporosity; cohesion; constiption, consistence, spissitude. hydrometer, areometer. consolidation; concretion, caseation, coagulation; petrification (hardening); crystallization, precipitation; deposit; precipitate, silt; inspissation; thickening. indivisibility, indiscerptibility, indissolvableness. mass, block, knot, lump; concretion, concrete, conglomerate; cake. clot, stone, curd, coagulum, grume; bone, gristle, cartilage.
Rarity –N. tenuity; absence of solidity; subtility; sponginess, compressibility. rarefaction, expansion, dilatation, inflation, subtilization. ether (gas).
Thesaurus of Words and Phrases by Peter Mark Roget, M.D., F.R.S. Enlarged by John Lewis Roget, M.A., New Edition Revised and Enlarged by Samuel Romily Roget, M.A. Published by Grosset & Dunlap, the edition is copyright 1941, 1947.