organ compound organ AAO:0010015 AEO:0000024 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. BILA:0000024 CARO:0000024 EHDAA2:0003024 HAO:0000024 TADS:0000598 TAO:0000496 TGMA:0001837 UBERON:0003103 VHOG:0001723 XAO:0003041 ZFA:0000496 organ this class was introduced for consistency with CARO. However, in this ontology we typically classify organs directly under 'organ' rather than subdividing into compound and simple organs uberon