It's a bit tricky because the whole word "axillary" is actually derived from the Latin word "axilla," which means "armpit." So the suffix is "ary" but it's used to create the adjective "axillary" from the noun "axilla".
It's a bit tricky because the whole word "axillary" is actually derived from the Latin word "axilla," which means "armpit." So the suffix is "ary" but it's used to create the adjective "axillary" from the noun "axilla".