shimmer

Short definition from Wiktionary

Verb

1. 1
   To shine tremulously or intermittently; to gleam faintly.
2. 2
   Of a mass of bees: to move their abdomens in a coordinated manner so as to produce a shimmering wave effect, thought to deter predators.

Noun

1. 1
   A faint or veiled and tremulous gleam or shining.
2. 2
   A measure of the irregularities in the loudness of a particular pitch over time.
3. 3
   A thin electronic device that is fit inside a card reader, such as on automated teller machines (ATMs), or point-of-sale terminals (POS's), that acts as an intermediate interface between the chip on a chip-and-pin technology card and the chip reader of the machine, to allow one to clone the chip.