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Definition of orifice : A mouth or aperture, as of a tube, pipe, etc.; an opening; as, the orifice of an artery or vein; the orifice of a wound.

Synonyms:

possible action, scuttle, chess opening, first step, opening night, curtain raising, possibility, opening move, hatchway, open, initiative, outlet, vent, porta

embouchure, cleft, hole, hatch, crack, chasm, mouth, gate, opening, pore, portal, yawning, door, gap, entrance, aperture, inlet

Usage examples:

• The dependent orifice at the sole should be kept open for as long as possible, being occasionally trimmed round with the drawing- knife, and scooped out with a sharp- edged director. - "Diseases of the Horse's Foot", Harry Caulton Reeks.
• To play this game a little orifice is made in the ground and a skin put in it; often it is also played on a robe. - "Indian Games", Andrew McFarland Davis.
• With her two hind- legs stuck into the tube to obtain a purchase and the six others spread around the orifice, the better to perceive on every side the quiver which gives the signal of a capture, the Segestria waits motionless, at the entrance of her funnel, for an insect to become entangled in the snare. - "More Hunting Wasps", J. Henri Fabre.