Associations to the word «Rarefaction»

Wiktionary

RAREFACTION, noun. A reduction in the density of a material, especially that of a fluid

Dictionary definition

RAREFACTION, noun. A decrease in the density of something; "a sound wave causes periodic rarefactions in its medium".

Wise words

Words are always getting conventionalized to some secondary meaning. It is one of the works of poetry to take the truants in custody and bring them back to their right senses.
William Butler Yeats