WordNet (r) 3.0 (2006):

inclinometer
    n 1: an instrument showing the angle that an aircraft makes with
         the horizon
    2: a measuring instrument for measuring the angle of magnetic
       dip (as from an airplane) [syn: inclinometer, dip circle]
    3: an instrument used by surveyors in order to measure an angle
       of inclination or elevation [syn: clinometer,
       inclinometer]