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insessorial Definition

in·ses·so·rial (in′se sôr′ē əl)

adjective

adapted for perching, as a bird's foot or claw: also said of birds that frequently perch

Etymology: < ModL Insessores, pl., perching birds < L insessor, occupant, lit., one who sits in or on < insidere (see insidious) + -ial