Dictionary.net

• [Latin] Closed in; as O. foramen (Foramen obturatum= thyroid foramen).

1900 - A dictionary of medicine and the allied sciences
By Alexander Duane

• Stop up, close, seal, (orifice in body, breech of gun, &c.). Hence or cogn. obturation, obturator (2), nn. [Latin]

1919 - The concise Oxford dictionary of current English
By Sir Augustus Henry