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RNA (n.)
1948, abbreviation of ribonucleic acid (see ribonucleic).
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template (n.)
1670s, templet "horizontal piece under a girder or beam," probably from French templet "weaver's stretcher," diminutive of temple, which meant the same thing, from Latin templum "plank, rafter," also "consecrated place" (see temple (n.1)).

The meaning "pattern or gauge for shaping a piece of work" is first recorded 1819 in this form, earlier temple (1680s); the form was altered mid-19c., probably influenced by plate [Barnhart], but the pronunciation did not begin to shift until more recently (templet is still the primary entry for the word in Century Dictionary).
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rRNA (n.)

stands for ribosomal RNA; see ribosome + RNA.

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retrovirus (n.)

1977, earlier retravirus (1974), from re(verse) tra(nscriptase) + connective -o- + virus. So called because it contains reverse transcriptase, an enzyme that uses RNA instead of DNA to encode genetic information, which reverses the usual pattern. Remodeled by influence of retro- "backwards."

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coronavirus (n.)

type of RNA virus affecting birds and mammals, in humans as a respiratory tract infection, by 1968, is so called for the spikes that protrude from its membranes and resemble the corona of the sun; see corona.  Covid as a contraction of coronavirus disease seems to have been coined for the outbreak that began in China in 2019 (COVID-19).

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