Sub- crossword

existing or operating in the mind beneath or beyond consciousness.
situated or lying under the skin, as tissue.
a secondary or subordinate title of a literary work, usually of explanatory character.
a large, relatively self-contained landmass forming a subdivision of a continent.
an act or instance of submitting.
to divide (that which has already been divided) into smaller parts; divide again after a first division.
Also called, especially British, tube, underground. an underground electric railroad, usually in a large city.
to conquer and bring into subjection
to put or sink below the surface of water or any other enveloping medium.
a vessel that can be submerged and navigated under water, usually built for warfare and armed with torpedoes or guided missiles.
that which forms a basic matter of thought, discussion, investigation, etc.
to irrigate beneath the surface of the ground, as with water passing through a system of underground porous pipes or transmitted through the subsoil from ditches, etc.
below the freezing point.