| Adar. |
Ornithology |
| Addysg |
Education |
| Amaeth. |
Agriculture |
| Anat. |
Anatomy |
| Arch. |
Archaeology |
| Arg. |
Typography, Printing |
| Athr. |
Philosophy |
| Beibl. |
Biblical |
| Biocem. |
Biochemistry |
| Biol. |
Biology |
| Bot. |
Botany |
| Brdd. |
Poetry, Bardism |
| c.d. |
Bardic Prosody |
| Celf (Chelf) |
Art |
| Cem. (Chem.) |
Chemistry |
| Cem. Organig |
Organic Chemistry |
| Cem., Ffis., a Math. |
Chemistry, Physics, and Mathematics |
| Cerdd Dafod a Cherdd Dant |
Cerdd Dafod and Cerdd Dant (Strict Metre Poetry and Bardic Prosody) |
| Cerdd Dant |
Cerdd Dant (Bardic Prosody) |
| Crdd. (Chrdd.) |
Music |
| Crf. (Chrf.) |
Religion |
| Cyfr. (Gyfr.) |
Law |
| Cyfrifiadura (Chyfrifiadura) |
Computing |
| Chwedl. |
Mythology |
| Chwedl. Glasurol |
Classical Mythology |
| Daearydd. |
Geography |
| Deint. |
Dentistry |
| Derwydd. |
Druidism |
| Diar. |
Proverbs |
| Diwin. |
Theology |
| Drg. |
Geology |
| Ecoleg |
Ecology |
| Econ. |
Economics |
| Egl. |
Ecclesiastical |
| Elec. |
Electronics |
| Ent. |
Entomology |
| ffig. |
figurative |
| Ffis. |
Physics |
| Ffisioleg |
Physiology |
| Ffren. |
Phrenology |
| Gardd. |
Horticulture |
| Geom. |
Geometry |
| Gram. |
Grammar |
| Gwaith coed |
Woodwork |
| Gwleid. |
Politics |
| Gwniad. |
Sewing |
| Gwydd. |
Irish |
| Gwyddon. |
Science |
| Hanes. |
History |
| Hen Wyddoniaeth |
Old Science |
| Her. |
Heraldry |
| Ieith. |
Philology, Linguistics |
| Llong. |
Seamanship |
| Math. |
Mathematics |
| Meddyg. |
Medicine |
| Metaffiseg |
Metaphysics |
| Mecaneg |
Mechanics |
| Meteoroleg |
Meteorology |
| Milfeddyg. |
Veterinary Science |
| Moes. |
Ethics |
| Mwyn. |
Mineralogy |
| Peir. |
Engineering |
| Pensaer. (Phensaer.) |
Architecture |
| Pysg. |
Ichthyology |
| Rhes. |
Logic |
| Rhet. |
Rhetoric |
| Rhif. |
Arithmetic |
| Seic. |
Psychology |
| Seiciatreg |
Psychiatry |
| Sein. |
Phonetics |
| Ser. |
Astronomy |
| Serdd. |
Astrology |
| Swol. |
Zoology |
| Tryd. (Thryd.) |
Electronics |
