mesoplankton

[mez-uh-plangk-tuhn, mes-, mee-zuh-, -suh-]

noun

plankton that live at middle depths.

planktonic organisms between 0.04 and 0.4 inches (1 mm and 1 cm) in length.

Origin:
1895–1900; meso- + plankton

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Mesoplankton is always a great word to know.

So is callithumpian. Does it mean:

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

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mes·o·plank·ton