membrane
n. a thin sheet of tissue or layer of cells acting as a boundary, lining, or partition in an organism.
permeability
n. the quality of a material that causes it to allow liquids or gases to pass through it
accumulation
n. the acquisition or gradual gathering of something
photovoltaic
a. related to using sunlight to cause a chemical reaction that produces electricity
annotate
v. make critical or explanatory notes or comment
power grid
n. a network of electrical transmission lines connecting generating stations to a wide area
daunt
v. make someone feel intimidated or apprehensive
regimen
n. a prescribed course of medical treatment, way of life, or diet for the promotion or restoration of health
clock
v. to time with a stopwatch or by an electric timing device
swim meet
n. a large gathering of athletes for a swimming competition