the outer boundary of an artifact or a material layer constituting or resembling such a boundary | animal reproductive body consisting of an ovum or embryo together with nutritive and protective envelopes; especially the thin-shelled reproductive body laid by e.g. female birds |
a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | one of the two male reproductive glands that produce spermatozoa and secrete androgens |
a superficial aspect as opposed to the real nature of something | oval reproductive body of a fowl (especially a hen) used as food |
information that has become public | |
the extended two-dimensional outer boundary of a three-dimensional object | |
the outermost level of the land or sea | |