Definition of concave in English:



  • Having an outline or surface that curves inwards like the interior of a circle or sphere:

    ‘concave lenses’
    Compare with convex
    • ‘McElwee contrasts convex and concave forms with building recesses and relief carvings.’
    • ‘You stand in a dark room looking at a round concave surface perhaps five feet in diameter.’
    • ‘If the outside edges appear to get sanded first, yet the middle part isn't affected, then you have a concave surface.’
    • ‘As the enamel shrinks on melting and cools with a concave surface, more has to be poured in and the process repeated.’
    • ‘It is possible to see the outline of a concave façade and shallow forecourt.’
    • ‘The human shoulder blade is a thin triangle of bone with a thick crest along one edge, and a shallow, concave joint surface in one corner.’
    • ‘Galileo's telescope had a convex object lens but a concave eye-piece.’
    • ‘Choose only firm tubers and look for those with tiny sprouts showing on their upper, concave surfaces.’
    • ‘The shape of each is similar, with a slightly concave surface, a rolled rim, and a high foot ring.’
    • ‘This is a small group of specialized ellesmerocerids with a concave outline of siphuncle segments.’
    • ‘You maintain your lower back curve, which is concave, by sitting straight in your chair.’
    • ‘Pictures of bound feet show the toes bent right under the sole, which is so curved it is concave.’
    • ‘Above it, to signal the presence of occupied space, is a shallow concave circle dug out of the ground.’
    • ‘Its profile may show anything from a rather gentle concave upward curve to a series of complex scarps and sediment-filled basins.’
    • ‘The exterior walls were composed of concave and convex red bricks.’
    • ‘The articular surface itself is concave, not convex as in many chelonioids.’
    • ‘Similar double curvatures were used for concave lenses, and even more complicated corrections for astigmatism.’
    • ‘The first surface of the head support arm is concave and the second surface of the head support arm is convex.’
    • ‘Where the old car had concave surfaces on the doors, the new doors swell outwards, lending more bulk to the profile.’
    • ‘Depressions are concave regions on protein surfaces that have no constriction at the mouth.’
    curved inwards, hollow, hollowed out, scooped out, depressed, sunken
    indented, recessed
    incurved, incurvate
    View synonyms


Late Middle English: from Latin concavus, from con- together + cavus hollow.