castanaretum

The additional -ār- element may be due to the influence of the Medieval Latin castanārius (“chestnut tree”).

• (Classical) IPA^(key): /kas.ta.naːˈreː.tum/, [käs̠t̪änäːˈreːt̪ʊ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /kas.ta.naˈre.tum/, [käst̪änäˈrɛːt̪um]

castanārētum n (genitive castanārētī); second declension

1. (Medieval Latin) Alternative form of castanētum

Second-declension noun (neuter).

• castanaretum in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• Niermeyer, Jan Frederik (1976) “castanaretum, castagnaretum”, in Mediae Latinitatis Lexicon Minus, Leiden, Boston: E. J. Brill, page 152/2