fissum

• (Classical Latin) 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:

     Nam non placet Stoicis singulis iecorum fissis aut avium cantibus interesse deum [...]

     One must say it does not become stoics thinking gods meddle with each and every crack of their own liver or else with the singing of birds [...]

Second-declension noun (neuter).

• *fissa f (Vulgar Latin)
• fissulum n (New Latin)

• Vulgar Latin: *fissa f
  • Old French: fesse f
    • Middle French: fesse f
      • French: fesse f

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.