Having to do with the mouth; given by mouth, as in an oral solution.
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Relating to the mouth. [L. os (or-), mouth]

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oral 'ōr-əl, 'ȯr-, 'är- adj
1 a) of, relating to, or involving the mouth: BUCCAL <the \oral mucous membrane>
b) given or taken through or by way of the mouth <an \oral vaccine> <an \oral suspension of a drug>
c) acting on the mouth <\oral diseases>
2) emphasizing lipreading and the development of vocal expression in teaching the deaf compare MANUAL (2)
3 a) of, relating to, or characterized by the first stage of psychosexual development in psychoanalytic theory during which libidinal gratification is derived from intake (as of food), by sucking, and later by biting
b) of, relating to, or characterized by personality traits of passive dependence and aggressiveness compare ANAL (2), GENITAL (3), PHALLIC (2)
oral·i·ty ȯ-'ral-ət-ē, ō- n, pl -ties
oral·ly adv

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1. relating to the mouth.
2. taken by mouth: applied to medicines, etc.

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(orґəl) [L. oralis] 1. pertaining to the mouth; taken through or applied in the mouth. 2. lingual (def. 2).

Medical dictionary. 2011.