A variant or archaic spelling of 'builder'; a person who constructs buildings or structures.
From Middle English 'bilden' (to build) or Old English 'byldan,' with '-er' suffix forming an agent noun. An older spelling before 'builder' became standardized.
Spelling variations like 'bilder' vs. 'builder' show how English orthography wasn't standardized until printing presses made consistency profitable—before then, people spelled phonetically.
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