The word 'larvae-supporting' is a compound formed from 'larvae' (the plural of 'larva', from Latin 'larva' meaning 'ghost, mask, or specter', later used in biology for the immature form of an insect) and 'supporting' (from Latin 'supportare', meaning 'to carry up').

'Larvae-supporting' is a modern English compound, created by combining the biological term 'larvae' with the participle 'supporting' to describe something that aids or sustains larvae.

Initially, the components meant 'larvae' and 'supporting', and together they now specifically refer to something that provides for or sustains larvae.