(added to verbs) A person or thing that does an action indicated by the root verb; used to form an agent noun. · (added to verbs, informal) A person or thing to which the root verb is done or can be done satisfactorily.
(networking) The first part of a packet or stream, often containing its address and descriptors.
(masonry) A brick that is laidsideways (on its largest face), for example at the top of a wall or within the brickwork, with its smallest side showing (oriented so that that side is wider than it is tall).
动词Verb
(sports, transitive) To strike (a ball) with one's head.