If the cyclopentane ring were planar. as Baeyer had predicted. it would have essentially
no angl e strain.. but it would have 10 pairs of eclipsed hydrogens. So cyclopentane
puckers. allowing some of the hydrogens to become nearly staggered but. in the process.
the molecule acquires some an~le strain. 1be puc kered fonn of cyclopcntane is called
the em'elope conformation. because the shape of the ring resembles a squarish envelope
with the flap up.

What does "puckered" mean in this context?

Question

If the cyclopentane ring were planar. as Baeyer had predicted. it would have essentially
no angl e strain.. but it would have 10 pairs of eclipsed hydrogens. So cyclopentane
puckers. allowing some of the hydrogens to become nearly staggered but. in the process.
the molecule acquires some an~le strain. 1be puc kered fonn of cyclopcntane is called
the em'elope conformation. because the shape of the ring resembles a squarish envelope
with the flap up.

What does "puckered" mean in this context?