One of the mysteries of the English language finally explained.
Having the form of a geometrid; resembling (that of) moths or caterpillars of the genus Geometra. Also: of or relating to a lepidopteran division Geometriformes comprising geometrids and related moths.
Mid 19th century; earliest use found in Henry Stainton (1822–1892), entomologist. From scientific Latin Geometra + -form.
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