Troeth
Yr hylif corfforol a secretir gan yr arennau ac ysgarthir gan yr wrethra yw troeth neu wrin.
Prif gyfansoddion troeth yw dŵr, wrea, sodiwm clorid, potasiwm clorid, ffosffad, asid wrig, halen organig, a'r pigment wrobilin.
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Diagram meddygol o liwiau gwahanol droeth, a luniwyd gan Gutun Owain -
Llawysgrif meddygol ar 'Ansoddau'r Trwnc', allan o Lyfr Coch Hergest: Kannys drwy ansoddeu y trwnc y gellir adnabot beieu dyn, a’e berygleu a’e heineu a’e gleuyt -
Sampl o droeth dynol.
_Ansoddau%27r_Trwnc.jpg)
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| Enghraifft o'r canlynol | math o sylwedd biogenig, dosbarth o endidau anatomegol  |
|---|---|
| Math | ysgarthiad, hylifau corfforol, secretiad neu ysgarthiad, endid anatomegol arbennig |
 Ffeiliau perthnasol ar Gomin Wicimedia | |
Cyfeiriadau
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