Noun: petra
Sample Sentences
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Generally, however, the stone or petra, almost always of 14 lbs., is used, the tod of 28 lbs., and the sack of thirteen stone. [1882, James Edwin Thorold Rogers, A History of Agriculture and Prices in England, volume 4, page 209:]
Nouns inflected like petra
greyware,
chronotropy,
urgrund,
cytosorting,
homekeeping,
pedobaiting,
winterdress,
JLNS,
rumpology,
hopkinsiaxanthin,
enchylemma,
further education,
hexobendine,
humdrumminess,
unobligingness,
backscroll,
telocinobufagin,
dosulepin,
mensuralism,
crème de framboise, etc. (List truncated at 20 nouns)
Etymology
From Latin petra (“rock”). Doublet of piedra. See: Latin Nouns '
petra'.