General dictionaries
General dictionaries are dictionaries that document contemporary vocabulary and are intended for everyday reference by native and fluent speakers.
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The University of Wales Dictionary of the Welsh Language (GPC) OBJECT LANGUAGE Welsh METALANGUAGE Welsh, English GENRE General dictionaries, Historical dictionaries, Etymological dictionaries https://geiriadur.ac.uk/gpc/gpc.html
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The Welsh Academy English-Welsh Dictionary Online OBJECT LANGUAGE Welsh METALANGUAGE English GENRE General dictionaries http://www.geiriaduracademi.org/This website will ask you to accept their terms and conditions on your first visit.
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A Welsh-English / English-Welsh on-line dictionary LOGIN REQUIRED
OBJECT LANGUAGE Welsh METALANGUAGE Welsh, English GENRE General dictionaries, Portals and aggregators, Learners' dictionaries http://www.gweiadur.com
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University of Wales Trinity St David Welsh-English / English-Welsh On-line Dictionary OBJECT LANGUAGE Welsh METALANGUAGE Welsh, English GENRE General dictionaries, Learners' dictionaries http://geiriadur.uwtsd.ac.uk/index.php
Portals and aggregators
Portals and aggregators are websites that provide access to more than one dictionary and allow you to search them all at once.
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Online version of Cysgair and the Termiadur Addysg OBJECT LANGUAGE Welsh METALANGUAGE Welsh, English GENRE Portals and aggregators, General dictionaries, Learners' dictionaries http://geiriadur.bangor.ac.uk/
Dictionaries on special topics
Dictionaries on special topics are dictionaries that focus on a specific subset of the vocabulary (such as new words or phrasal verbs) or which focus on a specific dialect or variant of the language.
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Geiriadur Rhywogaethau / A Dictionary of Species OBJECT LANGUAGE Welsh METALANGUAGE Welsh, English GENRE Dictionaries on special topics, Terminological dictionaries https://www.llennatur.cymru/Y-Bywiadur
Terminological dictionaries
Terminological dictionaries describe the vocabulary of specialized domains such as biology, mathematics or economics.
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Coleg Cymraeg Cenedlaethol Terms for Higher Education OBJECT LANGUAGE Welsh METALANGUAGE Welsh, English GENRE Terminological dictionaries https://colegcymraeg.ac.uk/termau/
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Y porth i adnoddau Gwasanaeth Cyfieithu Llywodraeth Cymru / Portal for the Welsh Government Translation Service’s resources OBJECT LANGUAGE Welsh METALANGUAGE Welsh, English GENRE Terminological dictionaries https://llyw.cymru/bydtermcymru
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Welsh National Terminology Portal OBJECT LANGUAGE Welsh METALANGUAGE Welsh, English GENRE Terminological dictionaries, Portals and aggregators http://termau.cymru
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Standardized terminology for the field of education OBJECT LANGUAGE Welsh METALANGUAGE Welsh, English GENRE Terminological dictionaries http://www.termiaduraddysg.org/