Definition of fusulina
1 capitalized : a genus (the type of the family Fusulinidae) of large fossil spindle-shaped foraminiferans having a test with 4-layered walls and deeply folded septa and serving as an index fossil in various Lower and Middle Pennsylvanian rocks
2 plural -s : an animal or fossil of Fusulina or a related genus
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Origin and Etymology of fusulina
New Latin, from Latin fusus spindle + -ulus (diminutive suffix) + New Latin -ina
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