said esp of crickets, grasshoppers, etc: to make a shrill creaking noise by rubbing together specialized body parts
stridulation /-ʹlaysh(ə)n/ noun
stridulatory /-lət(ə)ri/ adj
[earliest as stridulation from French, from Latin stridulus shrill, squeaky, from stridere, stridēre to make a harsh noise]