WordNet sense 1 (a round shape formed by a series of concentric circles (as formed by leaves or flower petals)):

coil, curlicue, ringlet, roll, scroll, whorl, gyre

WordNet sense 2 (American chemist who with Richard Smalley and Harold Kroto discovered fullerenes and opened a new branch of chemistry (born in 1933)):

Robert Curl, Robert F. Curl, Robert Floyd Curl Jr.

WordNet sense 3 (a strand or cluster of hair):

lock

WordNet sense 4 (shape one's body into a curl):

curl up, draw in

WordNet sense 5 (wind around something in coils or loops):

loop

WordNet sense 6 (twist or roll into coils or ringlets):

wave

WordNet sense 7 (form a curl, curve, or kink):

curve, kink