Saclike
Part of speech: adjective
Definition: Resembling a sac or some aspect of one.
Concave
Part of speech: noun
Definition: A concave surface or curve.The vault of the sky.One of the celestial spheres of the Ptolemaic or geocentric model of the world.An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.An indentation running along the base of a surfboard, intended to increase lift.An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.
Part of speech: adjective
Definition: curved inward like the inside of a bowl
Part of speech: verb
Definition: To render concave, or increase the degree of concavity.