| red algae |
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noun
-
(plural of, red alga)
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| red tide |
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noun
- an algal bloom of sufficient quantity to cause discoloration (often red) in a body of water; red tides can cause irritation or death to exposed creatures
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| retrovirus |
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noun (retroviruses)
-
(virology) A virus that has a genome consisting of RNA.
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| rickettsia |
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noun
-
a group of gram-negative bacteria, of the genus Rickettsia, carried as parasites by ticks, fleas and lice; they cause typhus and other diseases
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| Rod |
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proper noun
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(given name, male)
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| rotifer |
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noun
-
Any of many minute aquatic multicellular organisms, of the phylum Rotifera, that have a ring of cilia resembling a wheel
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