Relating to or of the nature of an effigy; representing a person or thing in sculptured or artistic form.
From effigy (a sculptured representation) + -ial (adjective suffix meaning 'relating to'). Effigy comes from Latin effigies (a representation, image), from effingere (to form, fashion).
You'd say a sculpture is 'effigial' if it's made to look like a specific person—it's a fancy adjective for 'in the style of a statue or image'!
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