Webster’s Revised Unabridged Dictionary · 1913
Bursa
Bur′sa (bûr′sȧ), n.; pl. Bursæ. [L. See Burse.] (Anat.) Any sac or saclike cavity; especially, one of the synovial sacs, or small spaces, often lined with synovial membrane, interposed between tendons and bony prominences.