Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
per-lābor, lapsus, 3 (inf. pres. perlabier, Lucr. 5, 766), v. dep. n., to slip or glide through (mostly poet.; perh. Cic. Tusc. 1, 12, 28, is also a poet. reminiscence): isque (aër) ita per nostras acies perlabitur omnes, Lucr. 4, 248; 4, 357; 5, 764 sq.: nulla nec aërias volucris perlabitur auras, Tib. 4, 1, 127; 4, 1, 155: atque rotis summas levibus perlabitur undas, glides along the surface of the waves, Verg. A. 1, 147: ad nos vix tenuis famae perlabitur aura, id. ib. 7, 646; Stat. S. 4, 6, 4: inde perlapsus ad nos et usque ad Oceanum Hercules, Cic. Tusc. 1, 12, 28.