The amount of light or material that fills a beam; a unit of measurement relating to the capacity of a beam.
From 'beam' + '-ful' (suffix meaning 'full of' or capacity). Standard formation similar to 'handful' or 'roomful'.
A 'beamful' of light is a poetic way to describe sunlight streaming through a window, though the word is rarely used in modern English except in creative or architectural writing.
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