| bigeminal | Paired; double; twin. (05 Mar 2000) |
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| bigeminal bodies | A bilateral single swelling of the roofplate of the embryonic midbrain that later in development becomes subdivided into a superior and an inferior colliculus. See: quadrigeminal bodies. Synonym: corpora bigemina. (05 Mar 2000) |
| bigeminal pregnancy | A pregnancy that may result from the fertilization of two separate ova or of a single ovum. See: twin. Synonym: bigeminal pregnancy. (05 Mar 2000) |
| bigeminal pulse | A pulse in which the beats occur in pairs. Synonym: bigemina, coupled pulse, pulsus bigeminus. (05 Mar 2000) |
| bigeminal rhythm | That cardiac rhythm when each beat of the dominant rhythm (sinus or other) is followed by a premature beat, with the result that the heartbeats occur in pairs (bigeminy). Synonym: coupled rhythm. (05 Mar 2000) |