nounπShareAn object such as a pillar or a rod that is used to tell time by the shadow it casts when the sun shines on it, especially the pointer on a sundial."The gnomon on the sundial in the park cast a long shadow, indicating it was late afternoon. "timeastronomytechnologyphysicsarchitecturesciencehistoryChat with AIVocabulary GamePractice Reading
nounπShareAn object such as a pillar used by an observer to calculate the meridian altitude of the sun (that is, the altitude of the sun when it reaches the observer's meridian), for the purpose of determining the observer's latitude."The student used a simple gnomon, a stick in the ground, to measure the sun's highest point at midday and then calculate the latitude of their school. "astronomytechnologygeographymathsciencephysicsspacetimeChat with AIVocabulary GamePractice Reading
nounπShareThe index of the hour circle of a globe."The teacher pointed to the globe and explained that the gnomon, a small rod extending from the North Pole, cast a shadow to show the current hour on the hour circle. "astronomytimemathtechnicalsciencedeviceChat with AIVocabulary GamePractice Reading
nounπShareA plane figure formed by removing a parallelogram from a corner of a larger parallelogram."The architect's drawing showed a gnomon, a shape formed by cutting a smaller rectangle from one corner of a larger rectangle. "mathfigureChat with AIVocabulary GamePractice Reading
nounπShare(by extension) A number representing the increment between two figurate numbers."In the sequence of square numbers (1, 4, 9, 16...), the gnomon between 9 and 16 is 7, representing the number of additional points needed to expand a 3x3 square into a 4x4 square. "mathnumberChat with AIVocabulary GamePractice Reading
