constratum
Could not find Constratis in Logeion dictionaries.
Constratis neuter ablative plural, neuter dative plural of constratum
constrātum, i, n., v. 1, consterno, I. 2.
cōnstrātum, ī, n., s. 1. cōn-sterno no. I, a, β.
cōnstrātum, (15) ī, n. (constratus), plancher : constrata pontium Liv. 30, 10, 14, le plancher des ponts ; constratum puppis Petr. 100, 6, pont dʼun navire.
Constrātum
In general, any flooring made of planks. Thus constratum navis, “the deck of a ship” (Petron.100); constratum pontis, “a bridgeway” (Livy, xxx. 10), etc.