'appendicular' originates from New Latin 'appendicularis', ultimately from Latin 'appendicula' (a diminutive of 'appendix'), where Latin 'appendere' meant 'to hang upon' or 'to attach'.

'appendicular' developed via New Latin 'appendicularis' from Medieval/Latin 'appendicula' (diminutive of 'appendix'), which itself comes from Latin 'appendere' ('to hang upon'); the English adjective was formed to describe things that are appended or related to appendages.

Initially related to the action 'to hang upon' or 'attach'; over time it came to mean 'pertaining to something appended' and, in anatomy, specifically 'pertaining to limbs or appendages' (the modern primary senses).