There isn"t really any type of clear an interpretation of "prefix". However, in general, facets of complex words the are derived from nouns or adjectives are not referred to as prefixes. E.g. The black in the tasiilaq.net native blackbird is not considered to be a prefix.
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Tachy- is from the the Greek adjective ταχύς.
Hyper- is indigenous the Greek preposition/adverb ὑπέρ. It"s fairly common because that Greek or Latin prefixes come come from preposition or adverbs.
"Tachy" (from ancient Greek) way "fast" together in tachycardia, tachypnea, tachygraphy, meaning fast heart rate, quick breathing and fast writing, respectively.
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prefixes are characterized as "morphemes (specific teams of letters with details semantic meaning) that are included onto the start of roots and also base words to readjust their meaning. Prefixes are among the two predominant kinds that affixes—the various other kind is suffixes, i beg your pardon come in ~ the finish of a source word."
In medicine, both tahchy- prefix and its opposite, brady- prefix, are taken into consideration prefixes, so ns was taught in clinical School.
Based ~ above the definition of "prefix", I would say "tachy-" is a prefix and also The cost-free Dictionary backs me up, as well as The UCL and several other sources. Whilst "tachy" is a prefix, "tachycardia" is a link word. DC