(uncountable) The act of criticising; a critical judgment passed or expressed / (countable) A critical observation or detailed examination and review.

An automatic safety feature of nuclear reactors where the control rods are automatically dropped into the reactor core when any of several emergency conditions are reached.

(Internet) A website that consolidates information from a multitude of other websites (often by means of newsfeeds), allowing users to view all of the information in one place.

Apparent chemotaxis due to random movement such as Brownian motion