The name 'chalcedony'' comes from Calcedon or Calchedon, an ancient port on the Sea of Marmara in. Onyx is a variety of the microcrystalline quartz, called chalcedony. Black Onyx is the anniversary gemstone for the 10th year of marriage. perhaps from a nail being used to mark that length on the end of a yardstick. Onyx is the birthstone for Leos and the anniversary gemstone for the 7th year of marriage. Phrase on the nail "on the spot, exactly" is from 1590s, of obscure origin OED says it is not certain it belongs to this sense of nail.Īs a unit of English cloth measure (about 2 1/4 inches) from late 14c. Onyx is a a semiprecious stone with alternating black and white bands. 1400) was "to drive home one's point, clinch an argument," and smiten the nail on the hed was "tell the exact truth" (mid-15c.). Onyx is also believed to enhance creativity and improve concentration, making it a useful tool for those who work in creative fields or need mental clarity. It can help to calm an overactive mind and improve mental clarity. To hit the nail on the head "say or do just the right thing" is by 1520s in Middle English driven in the nail (c. ONYX-015 (dl1520) is chimeric human group C adenovirus that has been genetically engineered to incorporate deletions in the E1B-55k and E3B regions ().The E1B protein in conjunction with E4ORF6 binds to the tumor suppressor protein p53 (). Onyx gemstone is known for reducing stress and anxiety and promoting overall emotional balance. The "fingernail" sense seems to be the original one, but many figurative uses are from the "small metal spike" sense: hard as nails is from 1828. Old English negel "tapering metal pin," nægl "fingernail ( handnægl), toenail," from Proto-Germanic *naglaz (source also of Old Norse nagl "fingernail," nagli "metal nail " Old Saxon and Old High German nagel, Old Frisian neil, Middle Dutch naghel, Dutch nagel, German Nagel "fingernail small metal spike"), from PIE root *(o)nogh "nail of the finger or toe" (source also of Greek onyx "claw, fingernail " Latin unguis "fingernail, claw " Old Church Slavonic noga "foot," noguti "fingernail, claw " Lithuanian naga "hoof," nagutis "fingernail " Old Irish ingen, Old Welsh eguin "fingernail, claw").
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