fissum

• (Classical) IPA^(key): /ˈfis.sum/, [ˈfɪs̠ːʊ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈfis.sum/, [ˈfisːum]

From the neuter of fissus (“cleft, cloven, split, divided”), the perfect passive participle of findō (“to cleave, split, divide”).

fissum n (genitive fissī); second declension

1. a cleft, slit, fissure; (especially anatomy) the cleft of the liver
   • 45 BCE, Cicero, De divinatione 1.52.118:

     iecorum fissīs

Second-declension noun (neuter).

• fissulum

See the etymology of the corresponding lemma form.

fissum

1. inflection of fissus:
   1. accusative masculine singular
   2. nominative/accusative/vocative neuter singular

• “findo”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “fissum”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• fissum in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.