The word 'woollen' is a straightforward compound formed within English from its native Germanic stock. Its first element, 'wool', descends directly from the Old English 'wull', which has cognates across Germanic languages tracing back to the Proto-Indo-European root wel- meaning "to tear, to pull", reflecting the ancient process of plucking or shearing wool from animals. The suffix '-en' (here appearing as '-len' after 'l') is an Old English adjectival suffix used to indicate the material something is made from, similar to its use in 'wooden' or 'earthen'. Thus, the literal construction "made of wool" has remained semantically transparent and unchanged in its core meaning from its Old English origins to modern usage.

Structure: wool (fibre) + len (adjective suffix) - wool: From Old English 'wull', meaning the soft hair from sheep. Origin: Proto-Germanic. - len: A variant of the adjective-forming suffix '-en', meaning "made of" or "consisting of". Origin: Old English.