achydd:achyddwr

(hwn) noun masculine (achyddion:achyddwyr)
in English is:

genealogist

Mutations

Soft:(no mutation)
Nasal:(no mutation)
Aspirate:(no mutation)

Use

yr achydd hwn
fy achydd i
dy achydd di
ei achydd ef/o
ei hachydd hi
ein hachydd ni
eich achydd chi
eu hachydd nhw/hwy
yr un achydd
y ddau achydd cyflym*
y tri achydd pell*
y pedwar achydd tawel*
y pum achydd bach*
y chwe achydd da*
y saith achydd glân*
yr wyth achydd llawn*
y naw achydd mawr*
y deg achydd rhyfedd*

* These adjectives were chosen based on their initial letter in order to demostrate their mutations, and therefore their meaning will not make sense after some nouns!

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