arched truss

arched truss

noun
a truss having an archlike form but unlike a true arch in that it is free to move horizontally at its base, as in expanding or contracting because of temperature changes.
Compare braced arch.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Arched truss is always a great word to know.
So is ninnyhammer. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a fool or simpleton; ninny.
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