ABSTRUSE, denotes something to be deep hidden, or far-removed from the common Apprehensions, and ways of conceiving ; in opposition to what is obvious and palpable.

In this Sense, Metaphysicks is an abstruse Science ; the new Doctrine of Infinites is an abstruse Point of Knowledge, that few People attain to. —
The Word is of Latin Original, Abstrufus ; form'd of abs, from, and trudo, I thruit ; q. d. being far off, and out of reach.