mindmap root((PERI)) perimeter The boundary or distance around a body or figure.
🌱In a medieval siege, an army would surround the perimeter of a city's high walls, denying the population any food from outside as it assaulted the walls with catapults and battering rams. 🌳The perimeter of a prison is ringed with high walls and watchtowers, and the entire perimeter of Australia is bounded by water. In geometry, you may be asked to calculate the perimeter of various geometrical shapes. In basketball, the perimeter is the area beyond the free-throw circle; a "perimeter player" tends to stay outside that circle. Try not to confuse this word with parameter, which usually means a rule or limit that controls what something is or how it can be done. periodontal Concerning or affecting the tissues around the teeth.
🌱Years of bad living had filled his teeth with cavities, but it was periodontal disease that finished them off. 🌳In dentistry, cavities are important but they aren't the whole story; what happens to your gums is every bit as vital to your dental health. When you don't floss regularly to keep plaque from forming on your teeth and gums, the gums will slowly deteriorate. Dentists called periodontists specialize in the treatment of periodontal problems, and when the gums have broken down to the point where they can't hold the teeth in place a periodontist may need to provide dental implants, a costly and unpleasant process. But even a periodontist can't keep your gums healthy; that job is up to you. peripatetic 1、 Having to do with walking.
2、 Moving or traveling from place to place.
🌱She spent her early adult years as a peripatetic musician, traveling from one engagement to another. 🌳The philosopher Aristotle had his school at the Lyceum gymnasium in Athens. The Lyceum may have resembled the Parthenon in being surrounded by a row of columns, or colonnade, which the Greeks would have called a peripatoi. Aristotle was also said to have paced slowly while teaching, and the Greek word for "pacing" was peripatos. And finally, peripatos meant simply "discussion." Whatever the source of the word, Aristotle and his followers became known as the Peripatetics, and the "pacing" sense led to peripatetic's English meaning of traveling or moving about. Johnny Appleseed is a good example of a peripatetic soul, and peripatetic executives and salespeople today stare into their laptop computers while endlessly flying from city to city. peripheral 1、 Having to do with the outer edges, especially of the field of vision.
2、 Secondary or supplemental.
🌱Like most good fourth-grade teachers, he had excellent peripheral vision, and the kids were convinced that he had eyes in the back of his head. 🌳Your peripheral vision is the outer area of your field of vision, where you can still detect movement and shapes. It can be very valuable when, for instance, you're driving into Chicago at rush hour, especially when switching lanes. When people call an issue in a discussion peripheral, they mean that it's not of primary importance, and they're probably suggesting that everyone get back to the main topic. Peripheral is now also a noun: computer peripherals are the added components—printers, webcams, microphones, etc.—that increase a computer's capacities.