carcinoembryonic antigen car·ci·no·em·bry·on·ic antigen (kär'sə-nō-ěm'brē-ŏn'ĭk)
A glycoprotein present in fetal gastrointestinal tissue, generally absent from adult cells with the exception of some carcinomas.
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.|