Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† 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.