[{"word":"concave","phonetic":"/ˈkɒŋkeɪv/","phonetics":[{"text":"/ˈkɒŋkeɪv/","audio":"https://api.dictionaryapi.dev/media/pronunciations/en/concave-us.mp3","sourceUrl":"https://commons.wikimedia.org/w/index.php?curid=2049276","license":{"name":"BY-SA 3.0","url":"https://creativecommons.org/licenses/by-sa/3.0"}}],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"A concave surface or curve.","synonyms":[],"antonyms":[]},{"definition":"The vault of the sky.","synonyms":[],"antonyms":[]},{"definition":"One of the celestial spheres of the Ptolemaic or geocentric model of the world.","synonyms":[],"antonyms":[],"example":"Aristotle makes [Fire] to move to the concave of the Moon. - Thomas Salusbury (1661)."},{"definition":"An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.","synonyms":[],"antonyms":[]},{"definition":"An indentation running along the base of a surfboard, intended to increase lift.","synonyms":[],"antonyms":[]},{"definition":"An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.","synonyms":[],"antonyms":[]}],"synonyms":[],"antonyms":[]},{"partOfSpeech":"verb","definitions":[{"definition":"To render concave, or increase the degree of concavity.","synonyms":[],"antonyms":[]}],"synonyms":[],"antonyms":[]},{"partOfSpeech":"adjective","definitions":[{"definition":"Curved like the inner surface of a sphere or bowl","synonyms":[],"antonyms":[]},{"definition":"(of a polygon) not convex; having at least one internal angle greater than 180 degrees.","synonyms":[],"antonyms":[]},{"definition":"(of a real-valued function on the reals) satisfying the property that all segments connecting two points on the function's graph lie below the function.","synonyms":[],"antonyms":[]},{"definition":"Hollow; empty","synonyms":[],"antonyms":[]}],"synonyms":[],"antonyms":["convex"]}],"license":{"name":"CC BY-SA 3.0","url":"https://creativecommons.org/licenses/by-sa/3.0"},"sourceUrls":["https://en.wiktionary.org/wiki/concave"]}]