Two sides adjacent to a right angle.
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The side that is not adjacent to another side of a triangle is called the opposite side.
the tangent of an angle is opposite over adjacent side of triangle
That's the cosine of the angle to which the 'adjacent' side is adjacent.
Those are the triangle's "legs".
Adjacent means next to. So you're asking what sides of a triangle are next to the right angle of a triangle. That would be the 2 shorter sides of the triangle or 'legs' of the triangle. The hypotenuse (which is the longest side of the triangle) is directly across from the right angle.