Kryptonite

noun

any surviving fragment of the exploded mythological planet Krypton, home of Superman
n.

fictional substance in the “Superman” series, where it weakens the otherwise invulnerable hero, 1943; perhaps from elements of krypton (which is a gas) + meteorite.

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Krytron
/ˈkraɪtrɒn/ noun 1. (electronics) a type of fast electronic gas-discharge switch, used as a trigger in nuclear weapons noun a high-speed solid-state switching device triggered by light pulses and used in nuclear devices Word Origin 1994
KS
1. Kansas (approved especially for use with zip code). [key] /keɪ/ noun, plural K’s or Ks, k’s or ks. 1. the eleventh letter of the English alphabet, a consonant. 2. any sound represented by the letter K or k, as in bilk, kit, or sick. 3. something having the shape of a K . 4. […]
Ksc
Kennedy Space Center

K-selected
Ecology. 1. selection occurring when a population is at or near the carrying capacity of the environment, which is usually stable: tends to favor individuals that successfully compete for resources and produce few, slowly developing young, and results in a stable population of long-lived individuals. Compare .
K-selection
Ecology. 1. selection occurring when a population is at or near the carrying capacity of the environment, which is usually stable: tends to favor individuals that successfully compete for resources and produce few, slowly developing young, and results in a stable population of long-lived individuals. Compare .