The noun GOSSAMER has 2 senses: 1. a gauze fabric with an extremely fine texture. 2. filaments from a web that was spun by a spider. Familiarity information: GOSSAMER used as a noun is rare.• GOSSAMER (adjective). The adjective GOSSAMER has 2 senses: 1. characterized by unusual lightness and delicacy. 2. so thin as to transmit light. Familiarity information: GOSSAMER used as an adjective is rare.amiliarity information: GOSSAMER used as a noun is rare. • GOSSAMER (adjective). The adjective GOSSAMER has 2 senses: 1. characterized by unusual lightness and delicacy. 2. so thin as to transmit light. Familiarity information: GOSSAMER used as an adjective is rare.