an indigenous language that contributes features to the language of an invading people who impose their language on the indigenous population | the outer boundary of an artifact or a material layer constituting or resembling such a boundary |
any stratum or layer lying underneath another | a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight |
a surface on which an organism grows or is attached | a superficial aspect as opposed to the real nature of something |
the substance that is acted upon by an enzyme or ferment | information that has become public |
| the extended two-dimensional outer boundary of a three-dimensional object |
| the outermost level of the land or sea |