an opaque, white or black-and-white disk used to measure the cloudiness or turbidity of ocean water by the point at which it is no longer visible from the surface.
An instrument used for measuring the clarity of water, especially seawater. It consists of a circular plate divided into alternating black and white quadrants and attached to a long measuring tape. The plate is lowered into the water, and the depth at which it is no longer visible from the surface is recorded. The Secchi disk is named after its inventor, Italian astronomer Angelo Secchi (1818-1878). See also Secchi depth.
noun 1. fresco secco. adjective 2. (of notes or passages in a musical score) played and released abruptly and without resonance. noun (pl) -cos 1. wall painting done on dried plaster with tempera or pigments ground in limewater Compare fresco 2. any wall painting other than true fresco
- Season creep
noun 1. the gradual changing in the length of the seasons, as demonstrated by earlier flowering of plants, etc, thought by many to be caused by climate change
- Seasonal unemployment
seasonal unemployment definition Periodic unemployment created by seasonal variations in particular industries, especially industries such as construction that are affected by the weather.
verb (used without object), seceded, seceding. 1. to withdraw formally from an alliance, federation, or association, as from a political union, a religious organization, etc. verb 1. (intransitive) often foll by from. (of a person, section, etc) to make a formal withdrawal of membership, as from a political alliance, church, organization, etc