ostiolum

ostiolum (plural ostiola)

1. Alternative form of ostiole.

From ōstium +‎ -olum (diminutive suffix).

ōstiolum n (genitive ōstiolī); second declension

1. diminutive of ōstium (“door”): small door

Second-declension noun (neuter).

• “ostiolum”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press
• "ostiolum", in Charles du Fresne du Cange, Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• “ostiolum”, in Gaffiot, Félix (1934), Dictionnaire illustré latin-français, Hachette.