adjective - working secretly, especially as a police officer trying to get information without people knowing who you really are
noun - the place where a crime happened and where the police look for clues and evidence
noun - a male reproductive cell that can join with a female egg to create a new life
noun - an animal or human in the early stages of development before birth, especially before all the main body parts are formed
noun - an organ that develops in the uterus during pregnancy to provide oxygen and nutrients to the developing baby and remove waste products from the baby's blood
adjective - not allowed or not suitable to do something or receive something, especially by law or by rules
noun, British English - a small box on a form, screen, or document that can be ticked (checked) or left empty to indicate a choice, selection, or preference
noun, American English - a small box on a form, screen, or document that can be ticked (checked) or left empty to indicate a choice, selection, or preference
adjective - lacking originality, freshness, or significance; overused and uninteresting
verb - to stimulate or increase interest, appetite, or desire
noun, technical - a substance used to fill gaps, spaces, or irregularities in a surface, material, or structure, often to create a smooth or even finish
adjective - easily bent, shaped, or manipulated without breaking; soft and pliable in texture