The Collaborative International Dictionary
Superjacent
Superjacent \Su`per*ja"cent\, a. [L. superjacens, p. pr. of superjacere; super above + jacere to lie.] Situated immediately above; as, superjacent rocks.
Wiktionary
superjacent
a. Positioned immediately above or on top of something else; overlying. (from 16th c.)
WordNet
superjacent
adj. lying immediately above or on something else [ant: subjacent]