the word 'whale' originates from the old english 'hwæl', which referred to any large sea fish or marine animal. this old english term is derived from the proto-germanic 'hwalaz', a word of uncertain deeper origin, though it may be connected to the latin 'squalus' meaning 'a kind of large sea fish'. the semantic narrowing to specifically denote the large marine mammals we know today occurred within english. the verb sense, meaning 'to thrash soundly', emerged in the late 18th century, likely drawing a metaphorical connection to the immense force of a whale's tail.

the word 'whale' is a simplex word of germanic origin. it does not break down into smaller, meaningful morphemes within modern english spelling.