cirral / seral [ˈsɪrəl]
cirral – adj. – 1. of or relating to a cirrus: curb-like tuft, tendril; 2. any of various slender usually flexible appendages of animals; 3. a white filmy variety of cloud usually formed in the highest cloud region
seral – adj. – of, relating to or characterized of an ecological sere: a series of ecological communities that follow one another in the course of the biotic development of an area or formation from pioneer stage to climax