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Use "feculae" in a sentence
"Scoriae, in a state of dust, like powdered pumice-stone, and grayish ashes as small as the finest feculae, were held in suspension in the midst of their thick folds."
"Scorias, in a state of dust, like powdered pumice-stone, and greyish ashes as small as the finest feculae, were held in suspension in the midst of their thick folds."