From a- +‎ doito +‎ -ar of from ha doito, "(he/she/it) is used to…".

• IPA^(key): [aðojˈtaɾ]

adoitar (first-person singular present adoito, first-person singular preterite adoitei, past participle adoitado)

1. to accustom; to be used to

   Synonym: afacer

   Tarde vès, e non m'espanta, que j'adoitas de tardar. Auga de moitos regueiros è mala d'arrecadar (folk song, 19th century)

   You are late, I'm not surprised: now you are usually late; water from many streams is hard to gather

• adoito
• doito
• haber doito

• Antón Luís Santamarina Fernández, editor (2006–2013), “adoitar”, in Dicionario de Dicionarios da lingua galega [Dictionary of Dictionaries of the Galician language] (in Galician), Santiago de Compostela: Instituto da Lingua Galega
• Antón Luís Santamarina Fernández, Ernesto Xosé González Seoane, María Álvarez de la Granja, editors (2003–2018), “adoitar”, in Tesouro informatizado da lingua galega (in Galician), Santiago de Compostela: Instituto da Lingua Galega