Bailly
v. λυγκούριον.
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LSJ
τό (derived by the ancients from λύγξ, οὖρον, and supposed to be the coagulated urine of the lynx, Dsc. 2.81, Plu. 2.962f, S.E. P. 1.119), a kind of amber (glossed by ἤλεκτρον, Hsch., cf. Str. 4.6.2), Thphr. Lap. 28, IG 11(2).161 B 49 (Delos, iii BC), al., 2². 1534.100, Str. 4.5.3 (pl.); — also written λυγκούριον, λιγκούριον, and λιγγούριον in codd. ; λογγούριον Aët. 2.35.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
τό, Plut. Sol. an. 4, s. λυγκούριον.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)