The Collaborative International Dictionary of English v.0.48:
Bathometer \Ba*thom"e*ter\, n. [Gr. baqo`s depth + -meter.] An instrument for measuring depths, esp. one for taking soundings without a sounding line. [1913 Webster]WordNet (r) 3.0 (2006):
bathometer n 1: an instrument that measures the depth of water [syn: bathymeter, bathometer]