navicula

noun
na·vic·u·la | \nəˈvikyələ\

Definition of navicula 

1 plural -s : an incense boat

2a capitalized : a very large genus (the type of the family Naviculaceae) of diatoms having a lanceolate or boat-shaped usually free-floating frustule covered with minute striae

b -s : a plant of the genus Navicula

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History and Etymology for navicula

in sense 1, from Medieval Latin, from Latin, small ship, diminutive of Latin navis ship; in sense 2, New Latin, from Latin

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