Complicated and difficult; knotty.
Curling in a direction, as opposed to straight (quotation marks or apostrophes)
Having curls.
a person or animal with curly hair.
Intricate, involved, entangled, complicated, complex.
A genealogical coefficient of a given genealogical tree; defined as the difference between the number of theoretical ancestors of a person and the number of his/her real ones in a given generation (the degree of pedigree collapse).