8 letters · 10 points in Scrabble
adjective designating an airship having a shape maintained only by internal gas pressure and without a supporting structure
originEtymology tree English non- Proto-Indo-European *Hreyǵ-der. Proto-Italic *rigēō Latin rigeō Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin rigidusder. Middle English rigide English rigid English nonrigid From non- + rigid.
Etymology from Wiktionary, CC BY-SA 3.0