10 letters · 11 points in Scrabble
verb make a shrill creaking noise by rubbing together special bodily structures
originBack-formation from stridulation. (From earlier term stridulous; from Latin strīdulus (“giving a shrill sound, creaking”), from strīdō (“utter a shrill or harsh sound; creak, shriek, grate, hiss”))
Etymology from Wiktionary, CC BY-SA 3.0