Entry 1 sense Webster, 1913 Lernæa /(lẽr*nē"ȧ)/ · Ler·næ·a · IPA 01 n. A Linnæan genus of parasitic Entomostraca, -- the same as the family Lernæidæ. 1. A Linnæan genus of parasitic Entomostraca, -- the same as the family Lernæidæ.(Zool.)