Antonyms of adj planoconvex

1 sense of planoconvex

Sense 1
planoconvex -- (flat on one side and convex on the other)

INDIRECT (VIA convex) -> concave -- (curving inward)

Similarity of adj planoconvex

1 sense of planoconvex

Sense 1
planoconvex -- (flat on one side and convex on the other)
       => convex (vs. concave), bulging -- (curving or bulging outward)