[hahy-druh-skohp] /ˈhaɪ drəˌskoʊp/
an optical device for viewing objects below the surface of water.
any instrument for making observations of underwater objects
[hahy-druh-seer] /ˈhaɪ drəˌsɪər/ noun, Ecology. 1. a originating in water. /ˈhaɪdrəʊsɪə/ noun 1. a sere that begins in an aquatic environment
[hahy-droh-skee] /ˈhaɪ droʊˌski/ noun, plural hydro-skis. 1. a hydrofoil attached to a seaplane to aid in takeoffs and landings. /ˈhaɪdrəʊˌskiː/ noun 1. a hydrofoil used on some seaplanes to provide extra lift when taking off
[hahy-droh-skee] /ˈhaɪ droʊˌski/ noun, plural hydro-skis. 1. a hydrofoil attached to a seaplane to aid in takeoffs and landings.
[hahy-druh-sawl, -sol] /ˈhaɪ drəˌsɔl, -ˌsɒl/ noun, Physical Chemistry. 1. a colloidal suspension in water. /ˈhaɪdrəˌsɒl/ noun 1. (chem) a sol that has water as its liquid phase hydrosol hy·dro·sol (hī’drə-sôl’, -sōl’) n. A colloid with water as the dispersing medium.