ensilage
Word family
Synonym discussion
Sense: noun/2
'Ensilage' and 'silage' are near-synonyms for fermented fodder stored in a silo, but 'silage' is the everyday term on farms and in agricultural markets, while 'ensilage' is more technical and appears chiefly in textbooks and academic papers. 'Hay' is dried grass or legumes used as animal feed — the key difference is the preservation method: hay is dried in the field, whereas ensilage/silage is fermented while still moist. 'Fodder' is the broadest term of the three, covering any food given to farm animals, including hay, silage, grains, and processed feed. For example, a farmer might say 'I need more fodder for winter' (anything goes), but when placing a specific order they would ask for 'silage' or 'hay'. 'Ensilage' in that same situation would sound unusual — you would say 'silage' instead.
Etymology
'Ensilage' entered English in the late 1800s from French 'ensilage', which comes from 'ensiler' meaning 'to put into a silo'. The French word was borrowed from Spanish 'ensilar', built from 'en-' (in) and 'silo' (a pit or underground storage chamber). The word 'silo' itself traces back through Latin 'sīrus' to Greek 'siros', which meant a pit for storing grain. The technique of fermenting green fodder in sealed pits was first modernised in France during the 19th century, which is why the English term took its French form.
First known use
1876
1876, in the meaning defined at sense 1