lerp noun 3verb 1forms 3 noun3 •A sweet secretion, produced by the larvae of the family Psyllidae, that forms scales on eucalyptus leaves.These insects sit on the veins of tree leaves, sucking their sap and excreting a sugary solution known as lerp. — 2010 •One of the lice whose larvae produce this secretion. •Abbreviation of linear interpolation. verb1 •To interpolate linearly. formslerped · lerping · lerps