Entry 1 sense Webster, 1913 Spoonworm /(spo͞on"wûrm`)/ · Spoon·worm · IPA 01 n. A gephyrean worm of the genus Thalassema, having a spoonlike proboscis. 1. A gephyrean worm of the genus Thalassema, having a spoonlike proboscis.(Zool.)