A creature that is part owl and part something else; a hybrid or fantastical creature combining owlish and other characteristics.
From 'demi-' (half) + 'owl' (from Old English 'ule'). This appears to be a rare or invented term combining the productive prefix 'demi-' with a common English animal name, possibly appearing in literature or heraldry.
Medieval heraldry loved these hybrid creatures—a demiowl might appear in coat-of-arms designs combining the owl's wisdom with another animal's virtues, creating a symbol of compound qualities.
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