[[Ladawan:Portrait of W.C. Roentgen Wellcome M0010904.jpg|thumb|311x311px|Naresibe ni '''Wilhelm Röntgen''' an pinakaenot na [[Nobel Prize]] sa [[Pisika]] para sa saiyang pagkadiskobre sa [[X-ray]].]]
An '''siyentista''' o '''siyentipiko''' ([[Ingles]]: ''scientist'') iyo an tawo na minahimo nin siyentpikongmga siyentipikong pag-aadal para pauswagon an kaaraman sa sarong lado nin interes.<ref name="eowilsonfoundation">{{cite web|url=https://eowilsonfoundation.org/wp-content/uploads/2014/11/the-big-read-eusocial-climbers.pdf|title=Eusocial climbers|publisher=E.O. Wilson Foundation|access-date=3 September 2018|quote=But he’s not a scientist, he’s never done scientific research. My definition of a scientist is that you can complete the following sentence: ‘he or she has shown that...’,” Wilson says.}}</ref><ref name="researchcouncil">{{cite web|url=https://sciencecouncil.org/about-science/our-definition-of-a-scientist/|title=Our definition of a scientist|publisher=Science Council|access-date=7 September 2018|quote=A scientist is someone who systematically gathers and uses research and evidence, making a hypothesis and testing it, to gain and share understanding and knowledge.}}</ref>
Sa klasikal na panahon, mayo nin totoong suanoy na analogo nin sarong modernong siyentista. Imbes, an mga pilosopo iyoan nag-enganyo sa pilosopikal na pag-aadal nin kapalibotan na inaapod na pilosopiyang natural, sarong prekursor kan siyensyang natural.<ref name="Lehoux">{{cite book|title=Wrestling with Nature : From Omens to Science|last1=Lehoux|first1=Daryn|date=2011|publisher=University of Chicago , U.S.A. Press|isbn=978-0226317830|editor1-last=Shank|editor1-first=Michael|location=Chicago|page=39|chapter=2. Natural Knowledge in the Classical World|editor2-last=Numbers|editor2-first=Ronald|editor3-last=Harrison|editor3-first=Peter}}</ref> Dae hasta ika-19 na siglo kan an terminong ''siyentista'' iyo uminabot sa regular na paggamit pagkatapos na ini mahimomamokna kan mga teyolohiko, pilosopo, sagkod historyador kan siyensya na si [[William Whewell]] kankaidtong 1833.<ref name="Cahan Natural Philosophy">{{cite book|title=From Natural Philosophy to the Sciences: Writing the History of Nineteenth-Century Science|date=2003|publisher=University of Chicago Press|isbn=0-226-08928-2|editor1-last=Cahan|editor1-first=David|location=Chicago, Illinois}}</ref><ref name="Lightman2011">{{cite book|title=Wrestling with Nature : From Omens to Science|last1=Lightman|first1=Bernard|date=2011|publisher=University of Chicago Press|isbn=978-0226317830|editor1-last=Shank|editor1-first=Michael|location=Chicago|page=367|chapter=Science and the Public|editor2-last=Numbers|editor2-first=Ronald|editor3-last=Harrison|editor3-first=Peter}}</ref>
Sa modernong panahon, an nagkapirang mga siyentista iyo may mga halangkaw na degri<ref>Cyranoski, David; Gilbert, Natasha; Ledford, Heidi; Nayar, Anjali; Yahia, Mohammed (2011). [https://www.nature.com/news/2011/110420/full/472276a.html "Education: The PhD factory"]. ''Nature''. '''472''' (7343): 276–279. Bibcode:[https://ui.adsabs.harvard.edu/abs/2011Natur.472..276C 2011Natur.472..276C]. doi:[[doi:10.1038/472276a|10.1038/472276a]]. PMID [https://pubmed.ncbi.nlm.nih.gov/21512548 21512548].</ref> sa sarong lado nin [[siyensya]] sagkod nagpupursigi nin karera sa manlainlain na sektor kan ekonomiya arug kan akademya, industriya, gobyerno, sagkod dae pangkomersyong kapalibotan.<ref>Kwok, Roberta (2017). [http://www.nature.com/naturejobs/science/articles/10.1038/nj7676-419a "Flexible working: Science in the gig economy"]. ''Nature''. '''550''': 419–421. doi:[[doi:10.1038/nj7677-549a|10.1038/nj7677-549a]].</ref><ref>Woolston, Chris (2007). Editorial (ed.). [https://www.nature.com/news/many-junior-scientists-need-to-take-a-hard-look-at-their-job-prospects-1.22879 "Many junior scientists need to take a hard look at their job prospects"]. ''Nature''. '''550''': 549–552. doi:[[doi:10.1038/nj7677-549a|10.1038/nj7677-549a]].</ref><ref>Lee, Adrian; Dennis, Carina; Campbell, Phillip (2007). [[doi:10.1038/nj7677-549a|"Graduate survey: A love–hurt relationship"]]. ''Nature''. '''550''' (7677): 549–552. doi:[[doi:10.1038/nj7677-549a|10.1038/nj7677-549a]].</ref>
