specularium

Back-formed from the plural of speculāris.

• (Classical) IPA^(key): /spe.kuˈla.ri.um/, [s̠pɛkʊˈɫ̪äriʊ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /spe.kuˈla.ri.um/, [spekuˈläːrium]

speculārium n (genitive speculāriī or speculārī); second declension

1. a window-pane, a transparency, a piece of glass that lets through light into a building
   • Dig. 43, 24, 9, § 1 Ulpianus libro septuagensimo primo ad edictum

     Si tamen sera vel clavis vel cancellus vel specularium sit ablatum, quod vi aut clam agi non poterit.

     But if a door-bar or a key or a grate or a pane is carried away, be it by force or stealthily, there is no action [by interdict].

Second-declension noun (neuter).

¹Found in older Latin (until the Augustan Age).

• → Jewish Babylonian Aramaic: אִיסְפַּקְלָרְיָא (ʾispaqlāryā)

speculārium

1. genitive masculine/feminine/neuter plural of speculāris

• “specularis”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press