so·nar 
(sōnär′)
(sōnär′)n.
1. A system using transmitted and reflected underwater sound waves to detect and locate submerged objects or measure the distance to the floor of a body of water.
2. An apparatus, as one in a submarine, using sonar.
3. Echolocation.
[so(und) na(vigation and) r(anging).]
- suppuration
- suppurative
- supra-
- supracellular
- supragenic
- supraglottal
- supraliminal
- supralittoral
- supramaxilla
- supramaxillary
- supramolecular
- supranational
- supraorbital
- suprarenal
- suprarenal gland
- suprascapular
- supraventricular
- supravital
- supremacist
- supremacy
- suprematism
- suprematist
- supreme
- Supreme Being
- Supreme Court