uniramous

/ˌjunəˈreɪməs/
adjective
  1. Having only one branch or branch-like part; not divided into branches.
    • In crustaceans, some appendages are uniramous while others are biramous.
    • The biologist noted that the fossil showed a uniramous limb structure.
    • The uniramous antenna of the insect is simple and unbranched.