penetrable
1. [ adjective ] capable of being penetrated
Examples:

"penetrable defenses"

Related terms: vulnerable
2. [ adjective ] admitting of penetration or passage into or through
Examples:

"a penetrable wall" "penetrable defenses"

Related terms: impenetrable
Similar spelling:   penetrate
  penetralia
  penetrative
  penetrator
  penetratively
  penetratingly
  penetrability
  penetration
  penetrating