remnant.noun
what is left over; a small remaining part; remainder

regard.noun
careful consideration; attention; concern (she gives little regard to her appearance); respect and affection; esteem (high regard for his teacher); regard implies evaluation of worth rather than recognition of it; to look at attentively; observe closely; to look upon or consider in a particular way; to hold in esteem or respect (she regards her teachers highly); to relate or refer to; concern (this item regards their liability); to take into account; consider; good wishes expressing such sentiment (give the family my best regards); a particular point or aspect; respect (she was lucky in that regard); concerning; in regard to or with regard to; with respect to
intransitive verb senses.to look or gaze; to give heed; pay attention
regard, regarded, regarding, regards.transitive verbs
to take into account (I regard this birthday card as an example of her affection); consider; to care for; have reference to

regardless, regardlessly.adverbs
in spite of everything; anyway: continues to work regardless
regardless.adjective
heedless; unmindful
regardlessness.noun

irregardless.adverb
means regardless; it is a form that many people mistakenly believe to be a correct usage in formal style but that in fact has no legitimate antecedents in either standard or nonstandard varieties; the word was likely coined from a blend of irrespective and regardless; perhaps this is why critics have sometimes insisted that there is 'no such word' as irregardless (but ah these critics), a charge they would not think of leveling at a bona fide nonstandard word such as ain't, which has an ancient genealogy

remedial.adjective
providing or intending to provide a remedy
remediation.noun

remedy.noun
a means of counteracting something undesirable 

racist
a program and practice of racial segregation (separation of races; communist principle democracies use - divide & conquer), persecution and domination

recant, recanted, recanting, recants.verbs
to make a formal or public withdrawal or renunciation of beliefs, statements, etc. formerly held
transitive verb use.to make a formal retraction or disavowal of (a statement or belief to which one has previously committed oneself)
intransitive verb use.to make a formal retraction or disavowal of a previously held statement or belief
recanter, recantation.noun

reprehension.noun
reprehensible.adjective
deserving rebuke or censure; blameworthy; culpable
reprehensibility, reprehensibleness.nouns
reprehensibly.adverb

recombinant.adjective
relating to or exhibiting genetic recombination (recombinant progeny); relating to or containing recombinant DNA; produced by recombinant DNA technology 
recombinant.noun

recombinant DNA (reinsertion of concocted gene combinations)-noun
called this because the genes are made of DNA; genetically engineered DNA prepared in vitro (latin for 'living') by cutting up DNA molecules and splicing together specific DNA fragments usually from more than one species of organism; recombinant DNA is a way of joining genes in the test tube and reinserting them into an organism, the method being used to create organisms with combinations of characteristics that could not arise by natural means, resulting from novel (new) gene combinations, the old, classical rules, which restricted mating and genetic exchange to members of a species, no longer being necessary to apply-

retrovirus.noun
any of a family (Retroviridae) of RNA-viruses-(as HIV was once thought to be) that produce reverse transcriptase by means of which DNA is produced using their RNA as a pattern maker and incorporated into the genome of infected cells and that includes numerous tumorigenic viruses; the name "retroviruses" arises because of the copying of the RNA which forms the viral "genes" (the genome) "backwards" into DNA – a direction contrary to that long considered universal, that is, from DNA into RNA
retroviral.adjective

reiterate.transitive verb
inflected form(s)-reiterated; reiterating
to state or do over again
reiteration.noun
reiterative.adjective
reiteratively.adverb

repressive.adjective
causing or inclined to cause repression (a repressive dictatorship) repressively.adverb
repressiveness.noun

repress, repressed, repressing, represses.verbs
transitive use.to cause to hold back; put down; suppress; quell; stifle
intransitive use.to take repressive action
Psychology.-.to exclude (painful or unpleasant memories, for example) from the conscious mind
represser.noun
repressive, repressible.adjectives
repression.noun
the act of repressing or the state of being repressed
Psychology.-.the unconscious exclusion of painful impulses, desires, or fears from the conscious mind
repressionist.adjective
repressively.adverb
repressibility.noun

restrain.transitive verb
to hold back; constrict; to repress; to keep under control; to confine
restrainable.adjective
restarinedly.adverb
restrainer, restrainment, restraint.nouns

reverse transcriptase.noun
is an enzyme carried by an RNA-virus, but is unlike others of the same type (RNA viruses) in that this RNA genome makes it possible to replicate in a host (inhabits your body) as the other nucleic acid, DNA. It is therefore called a retrovirus

right angle.noun
an angle whose sides are perpendicular to each other; an angle of 90º,
examples  _| or —| or |_ , etc.

raft.noun
a great number, amount, or collection

relative.adjective
having pertinence or relevance; connected or related; considered in comparison with something else (the relative quiet of the suburbs); dependent on or interconnected with something else
relative.noun
one related by kinship, common origin, or marriage; something having a relation or connection to something else
relativeness.noun
Grammar.-.relative pronoun

relatively.adverb
in comparison with something else; in a relative manner