ostreum
Could not find ostreo in Logeion dictionaries.
ostreo Noun: neuter dative singular, Noun: neuter ablative singular of ostreum
ostrĕum, i, n., v. ostrea.
ostreum, ī, n., s. ostrea.
ostrĕum, (12) v. ostrea : Lucil. d. Gell. 20, 8, 4 ; Hor. S. 2, 4, 33 ; Plin. 32, 63 ; Juv. 4, 140 ; Ov. F. 6, 174.
➳ [genre incertain] Cic. Div. 2, 33 ; Fam. 7, 26, 2.
ostrĕum, i, n.: = ostrea.