Definition of convex in English:



  • 1Having an outline or surface curved like the exterior of a circle or sphere.

    ‘a convex lens’
    Compare with concave
    • ‘The exterior walls were composed of concave and convex red bricks.’
    • ‘This particular beach is many miles long and shaped like a new moon, a convex curve extending into the Gulf of Mexico.’
    • ‘Carve out squares of curving surfaces, concave and convex.’
    • ‘Through the convex lens these frozen moments in time are of the other ‘side’.’
    • ‘Go for a nice belly in the blade - a nice convex curve seriously improves cutting.’
    • ‘Sometimes, highlighted down the middle where the trees grew tall, the surface could look convex.’
    • ‘It weighs 440 g. One surface is smoothly convex and may have been used as a grinding stone.’
    • ‘Powerful images captured through a convex lens are frozen in time.’
    • ‘While the pillows are still partially molten they are compacted together so that they display convex upper surfaces and downwards-facing cusps at their contacts.’
    • ‘Galileo's telescope had a convex object lens but a concave eye-piece.’
    • ‘He likened this to asking an artisan to explain how the convex surface of a peg can possibly fill that of a concave hole.’
    • ‘Light enters the human eye via the transparent cornea, the eye's front window, which acts as a powerful convex lens.’
    • ‘From the level of tooth one to tooth five, the lateral surface is slightly convex.’
    • ‘The water column was lowered over the dry grains until the convex surface just touched them.’
    • ‘With water the surface is concave, with mercury it is convex.’
    • ‘Ridges on the convex surface are not as well developed as those on the flat surface.’
    • ‘The tongue normally offers a convex surface to the roof of the mouth: for an r-sound, the tongue surface is often hollowed out and the tip raised.’
    • ‘Surprised, Jeana turned to look at her reflection in the mirror with the convex surface.’
    • ‘The steroid treatment consisted of three implants per ear inserted subcutaneously on the convex surface of the ear.’
    • ‘For the ceiling, he ‘proposed a series of convex surfaces,’ lowered toward the front.’
    curved outwards, cambered
    rounded, bulging, swelling, protuberant
    View synonyms
  • 2(of a polygon) not having any interior angles greater than 180°.

    • ‘We used convex polygons to estimate distances between colony centers and the size of each colony to define the area of burrows in use by a family group in a current season.’
    • ‘A convex polygon with a triangle attached to one of its edges in this way is called a barbed polygon.’
    • ‘The 95% minimum convex polygon was estimated for each bird using all sightings.’
    • ‘Calculating the convex polygon for the immature male resulted in an inaccurate representation of his movement patterns.’
    • ‘However, despite such examples, it is commonly believed that if you restrict yourself to looking at convex polygons, this question has a positive answer.’


Late 16th century: from Latin convexus vaulted, arched.