Reading Theme:
Beam Definition, Usage & Key Differences Explained (2 meaning)
Meaning 1：ray of light (beam)
beam
/biːm/
n.
a line or stream of light coming from a bright source.
ray of light
➕
/reɪ əv laɪt/
n.
A concentrated line or shaft of light emitted from a source such as the sun, a lamp, or a laser.
📘 Details & Usage
📖 Root Explanation
From Old English 'bēam', meaning tree, post, or ray of light.
💡 Mnemonic
Think of a BEAM of light shining on a wooden BEAM in a barn. Both are long, straight, and prominent.
📖 Example
The little boy pointed his flashlight into the dark forest, and a narrow beam of light revealed a family of fireflies.
A narrow ray of light from his flashlight illuminated the fireflies.
🔗 Collocations
beam of light – A defined stream of illumination
laser beam – A highly focused, coherent beam of light produced by a laser
sunbeam – A visible ray of sunlight
🔄 Synonyms
🚫 Antonyms
darkness (n.) – The complete absence of light.
🌱 Derivatives
beaming (adj.) – Radiating light; smiling radiantly.
📖 Cultural Story
The word evolved from meaning 'tree' or 'timber' in Old English (as seen in place names like Holborn, 'hollow stream in the beam/tree'). It later extended to mean 'ray of light', perhaps inspired by the visual similarity of sunrays to long wooden planks, and then to the structural element in buildings. This semantic shift reflects a common pattern where a word for a solid object is applied to an intangible phenomenon.
Meaning 2：structural support (beam)
beam
/biːm/
n.
a long, strong piece of wood or metal used to support a roof or floor in a building.
structural support
➕
/ˈstrʌk.tʃər.əl səˈpɔːt/
n.
A long, sturdy piece of timber, steel, or other material, used horizontally as a primary support in construction to bear the weight of a structure.
📘 Details & Usage
📖 Example
The construction workers carefully lifted the heavy steel beam into place to form the skeleton of the new library's ceiling.
Workers positioned a heavy steel support to frame the ceiling.
🔗 Collocations
steel beam – A load-bearing structural member made of steel
wooden beam – A supporting timber used in construction
main beam – The primary horizontal support in a structure
🔄 Synonyms
🚫 Antonyms
collapse (n.) – The failure or falling down of a structure.
unsupported (adj.) – Lacking structural reinforcement or bearing.
🌱 Derivatives
crossbeam (n.) – A beam set transversely to support a structure.
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