One of the basic patterns of the human fingerprint (5)
(Other definitions for whorl that I've seen before include "ring of leaves" , "Fingerprint circle" , "botanical feature" , "Pattern in a fingerprint" , "Helix" .)
(Other definitions for arch that I've seen before include "This could be Wellington" , "Foremost" , "Bend into upward curve" , "Prefix meaning cheif, perhaps enemy" , "Inner part of foot" .)