agonisticadjective
/æɡ.əˈnɪs.tɪk/agonistic adjective (FIGHTING)
specialized biology, psychology relating to fighting or aggression (= spoken or physical behaviour that is threatening or involves harm to someone or something):
He published a study of agonistic behaviour in freshwater crayfish.
agonistic adjective (MUSCLES)
specialized anatomy relating to an agonist (= a muscle that is pulled in the opposite direction by another muscle):
agonistic muscles