noun - the process of making a liquid weaker or less concentrated by adding water or another liquid
noun - a cell in the nervous system that sends and receives electrical signals
noun, formal - the process of chewing food
verb, formal - to chew food
adjective - done or experienced without wanting or choosing it
adjective - happening without you deciding to do it
adjective - feeling quietly sad or thoughtful, often for no clear reason
adjective - having a speckled appearance of light and dark colours mixed together
adjective - having a mixture of dark and white or grey hairs
noun - an unpleasant, harsh, or metallic ringing sound made by metal objects hitting each other
verb - to make a harsh, discordant, metallic sound, or to cause something to make such a sound
adjective - describing petrol that contains lead compounds
adjective - describing petrol that does not contain lead, which is less harmful to the environment and engines
noun, British English - a list of people showing when they are on duty, working, or taking part in an activity