apophysis

noun3

1. •
   A natural outgrowth, swelling or enlargement, usually of an organism; a protuberance on a bone.

   • In the male each palpal tibia shows a long narrow apophysis on the outerside. — 1913
2. •
   The external part of a cone scale.
3. •
   A branch of a dike or vein.

   • Minor palingenetic magmas probably were generated at this time and intruded the mantling rocks in the form of small sills and apophyses; … — 1980