'lanceolate-leaved' is a compound formed from 'lanceolate' and 'leaved'. 'Lanceolate' originates from Latin, specifically the Medieval/Modern Latin word 'lanceolatus', where 'lancea' meant 'spear' and the suffix '-atus' formed adjectives; 'leaved' comes from Old English 'lēaf' (leaf) with the adjectival suffix '-ed' meaning 'having leaves'.

'lanceolate' passed into botanical English via Medieval/Modern Latin 'lanceolatus' (a diminutive of 'lancea') and was adopted in English botanical usage as 'lanceolate'; 'leaved' derives from Old English 'lēaf' and the past-participial/adjectival suffix '-ed', forming compounds like 'broad-leaved' and 'narrow-leaved', eventually yielding 'lanceolate-leaved' in descriptive botany.

Initially, 'lanceolate' literally referred to a small or lance-like shape ('like a small lance'), and over time it became a fixed botanical adjective meaning 'lance-shaped'; 'leaved' has consistently meant 'having leaves' in compound adjectives, so the compound now specifically means 'having lance-shaped leaves'.