Persideo, pérsides, pen. cor. persédi, pe. prod. persessum, persidêre. Plin. To sit by: to abide stil.Pruina lapsa persider, gelatque. Plin.
Persido, persidis, p. prod. persédi, persessum, persidere. Lucret. To sinke, go downe, or settle to the bottome.-vbi frigidus imber altius ad viuum persedit. Virgil. Hath piersed deeper to the quick.
Lewis and Short: Latin dictionary
per-sĭdĕo, sēdi, sessum, 2, v. n. [per-sedeo], to continue sitting, remain long sitting anywhere, Plin. 17, 24, 36, 222; Curt. 9, 9, 23.
per-sīdo, sēdi, sessum, 3, v. n., to sink or settle down, to penetrate anywhere (poet.): pestilitas fruges persidit in ipsas, Lucr. 6, 1126; 1, 307: ubi frigidus imber Altius ad vivum persedit, Verg. G. 3, 442.