'latiseptate' originates from Latin elements and English formation: the prefix 'lati-' from Latin 'latus' (meaning 'broad') combined with 'sept-' from Latin 'septum' (meaning 'partition' or 'wall') and the English adjectival suffix '-ate'.

'latiseptate' was formed in modern scientific/technical usage by combining the Latin-derived prefix 'lati-' and the root 'septate' (from 'septum' + English adjectival formation) and entered English technical literature in the late 19th to 20th century as a descriptive term in biology and mycology.

Initially it meant 'having broad septa' or 'having septa set far apart' in a strictly morphological, technical sense; that meaning has been retained in contemporary scientific usage.