Set 156 · Study 1 / 5
Exitthe art and science of designing and using sundials
The ancient Greeks were pioneers in gnomonics, creating intricate sundials that allowed them to tell time using the position of the sun.
Set 156 of Word Ultra covers 5 words: gnomonics, pannychis, phacometer, caul, friability. Each entry below includes its definition, an example sentence, and synonyms — practice them with the interactive cards above.
the art and science of designing and using sundials
The ancient Greeks were pioneers in gnomonics, creating intricate sundials that allowed them to tell time using the position of the sun.
a night-long vigil or celebration
The community gathered for a lively pannychis, filled with music and dancing that lasted all through the night.
an instrument used to measure the refractive power of lenses or optical devices
The ophthalmologist used a phacometer to accurately assess the refractive power of the patient's new lenses.
a thin, filmy membrane that sometimes covers the head of a newborn
The newborn was delivered with a caul, which is believed by some cultures to be a sign of good luck.
the tendency of a material to crumble or break into smaller pieces
The friability of the soil can significantly affect its erosion potential during heavy rainfall.