[f. Gr. ἀπό away, off + μῆκ-ος length + μέτρ-ον measure.] An instrument for measuring the distance of objects.
1869. in Eng. Mech., 23 July, 389/3. The only mistake which could occur in using the apomecometer would be in assuming a wrong level, but, still, this would only make a trifling error.