the world > health and disease > ill health > deformity > [noun] > congenital union > of limbs (5)
In sense 6, as siren form, siren formation, siren-like.
A congenital malformation in which the long bones of one or more limbs are absent or rudimentary, resulting in the hand or foot being attached…
A malformation in which the legs or lower extremities are united.
A malformation in which a pair of limbs, esp. the hinder limbs, are fused into one.