General dictionaries are dictionaries that document contemporary vocabulary and are intended for everyday reference by native and fluent speakers.
New English-Irish Dictionary (NEID) OBJECT LANGUAGE Irish METALANGUAGE English GENRE General dictionaries http://www.focloir.ie/
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.
Learners' dictionaries are intended for people who are learning the language as a second language.
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.
Valency Dictionary of Irish Verbs OBJECT LANGUAGE Irish METALANGUAGE English, German GENRE Dictionaries on special topics http://www.potafocal.com/fbg/
Historical dictionaries are dictionaries that document previous historical states of the language.
Terminological dictionaries describe the vocabulary of specialized domains such as biology, mathematics or economics.
National Terminology Database for Irish OBJECT LANGUAGE Irish METALANGUAGE Irish GENRE Terminological dictionaries http://www.tearma.ie/