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“meronekon”
A partial swimmer or one that passes only part of its life-cycle swimming: Some water creatures are meronekons because they don't spend their whole life swimming in water.
This entry is located in the following units:
mer-, mero-, meri-, -mer, -merous, -mere, -meric, -meristic +
(page 3)
necto-, nect-, nekto-, nek- +
(page 1)