rudimentary

Etymology

rudiment + -ary

adj

1. Of or relating to one or more rudiments.
   I have only a rudimentary grasp of chemistry.
2. Basic; minimal; with less than, or only the minimum, necessary.
   His grasp of rudimentary English allowed him at least to do the shopping.
   His rudimentary driving skills meant that he was a danger on the road.
   Safdar, in his rudimentary ambulance, has been at the frontline of the shifting conflicts consuming his city, placing himself at huge personal risk for very little money. April 6, 2017, Samira Shackle, “On the frontline with Karachi’s ambulance drivers”, in the Guardian

noun

1. (zoology, usually in the plural) One of the rudimentary mammae of boars.