organ compound organ Anatomical structure that has as its parts two or more multi-tissue structures of at least two different types and which through specific morphogenetic processes forms a single distinct structural unit demarcated by bona fide boundaries from other distinct anatomical structures of different types. EHDAA2:0003024 VHOG:0001723 XAO:0003041 UBERON:0003103 uberon organ TGMA:0001837 HAO:0000024 BILA:0000024 CARO:0000024 ZFA:0000496 TAO:0000496 AAO:0010015 AEO:0000024 TADS:0000598