Polymer
Moleciwl mawr (neu facropolymer) a wnaed o unedau strwythur sy'n ailadrodd mewn patrwm ydy polymer. Clymir y'r is-unedau hyn at ei gilydd gan bondiau cofalent cemegol. Ar lafar gwlad rydym yn cysylltu'r gair "polymer" gyda phlastig, ond yn wyddonol gywir, mae'r gair yn amgylchynu peth wmbredd o gyfansoddion cemegol: rhai'n naturiol ac eraill yn ddefnyddiau synthetig gyda nodweddion gwahanol iawn.
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