opening (redirected from cardiac opening)

opening

1. Chiefly US a tract in a forest in which trees are scattered or absent

2. 

a. the first performance of something, esp a theatrical production

b. (as modifier): the opening night

3. a specific or formal sequence of moves at the start of any of certain games, esp chess or draughts

4. Law the preliminary statement made by counsel to the court or jury before adducing evidence in support of his case

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opening [′ōp·ə·niŋ]

(geography)

A break in a coastline or a passage between shoals, and so forth.

(mining engineering)

A widening of a crevice, in consequence of a softening or decomposition of the adjacent rock, so as to leave a vacant space.

A short heading driven between two or more parallel headings or levels for ventilation.

An area in a coal mine between pillars, or between pillars and ribs.

(oceanography)

Any break in sea ice which reveals the water.