Subjacent: Just beneath or underneath. The opposite of subjacent is superjacent. Other related terms include adjacent and circumjacent. From sub-, under + the Latin jacere, to lie = to lie under. Last Editorial Review: 9/14/2016 What Kind of Doctor Do I Need? Slideshow Dental (Oral) Health Quiz Causes of a Heart Attack Slideshow Health Solutions From Our Sponsors Health in Young Adults Open Heart Alternatives Travelers Diarrhea 21st Century Cures How to Save a Life Care for Aortic Stenosis? Nutritious Smoothies Family Wellness Consider Clinical Trials Bent Fingers? Delicious Alternative to Milk Tips to Beat Heartburn Treat Type 2 Diabetes Rehabilitation Services What is TAVR?