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The word clathratus could not be parsed. Trying a normal dictionary lookup:
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† clāthri (in MSS. also clātri), ōrum, m. (clātra, ōrum, n., corresp. to the Greek, prob. Prop. 4 (5), 5, 74), = κλῃθπα τά, a lattice, grate (esp. to the cages of animals), Cato, R. R. 4; Col. 8, 17, 10; Hor. A. P. 473; Plin. 8, 7, 7, § 21; Claud. III. Cons. Stil. 272; Inscr. Orell. 3299.
clāthro (in MSS. also clātro), no perf., ātum, 1, v. a. [clathri], to furnish with a grate or lattice, to set with bars (very rare), Cato, R. R. 4; Plaut. Mil. 2, 4, 26; Col. 9, 1, 4; Inscr. Grut. 207, 2.