is similar to
capable of being distended; able to stretch and expand
"the stomach is a distensible organ"
is similar to
filled with vascular sinuses and capable of becoming distended and rigid as the result of being filled with blood
"erectile tissue"; "the penis is an erectile organ"
is similar to
able to expand or be expanded
is similar to
designed to be filled with air or gas
"an inflatable mattress"; "an inflatable boat"