A tendril is a thin, flexible structure that plants use to attach themselves to other objects for support. The crossword solutions for the term 'tendril' are CURL (4 letters), WISP (4 letters), and CIRRUS (6 letters). CURL is a shape or movement that resembles a spiral or loop. A WISP is a small, thin, and light piece of something. CIRRUS is a type of cloud that is composed of ice crystals and appears in the form of delicate white filaments.