σπιδής

ές, έος
A. διὰ σπιδέος πεδίοιο Il. 11.754, which is expld. by the authorities cited in Sch.A as meaning either vast, broad, or rugged, difficult: the former interpr. is confirmed by other forms, viz. σπίδιον μῆκος ὁδοῦ A. Fr. 378 (which is expld. in EM 271.18 by μακρόν); σπιδόθεν, = μακρόθεν, Antim. 77; σπιδνός, = πυκνός, συνεχής, πεπηγώς, and σπιδόεις, = μέλας, πλατύς, σκοτεινός, μέγας, πυκνός, Hsch.; and σπίζω, = ἐκτείνω, Sch.Ar. V. 18, Eust. 996.22 sq. (Ptol. Asc. and others read δῑ ἀσπιδέος π., expld. either as round like a shield or covered with shields.)
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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