lightbulb
UK[ˈlaɪtbʌlb]US[ˈlaɪtbʌlb]
n
a glass bulb containing a wire filament that gives off light when an electric current passes through it.
Morpheme Breakdown
light
bulb
light
brightness, radiant energy
bulb
bulb, onion
Etymology
the word 'lightbulb' is a transparent modern english compound, formed by combining two distinct old roots. 'light' originates from proto-germanic 'leuhtą', related to the concept of brightness and illumination. 'bulb' traces back to latin 'bulbus', borrowed from greek 'bolbos', referring to a plant bulb or any rounded swelling. the compound term emerged in the late 19th century as a purely descriptive name for the new electric invention, logically denoting a 'bulb-shaped object that produces light'. its formation follows the common english pattern of creating new terms by directly combining existing words to describe their function and form.
Analysis
Structure: light + bulb
light: from old english 'leoht', meaning 'brightness, radiant energy'. functional role: root, specifying the type of energy produced.
bulb: from latin 'bulbus', meaning 'bulb, onion', via greek 'bolbos'. functional role: root, specifying the rounded, bulbous shape of the object.
Examples
he carefully screwed the new lightbulb into the socket.
the invention of the incandescent lightbulb revolutionized modern life.
a flickering lightbulb often needs to be replaced.