Etymology
Advertisement
vena cava (n.)
Medical Latin, from Latin vena "vein" (see vein) + cava, from cavus "hollow" (from PIE root *keue- "to swell," also "vault, hole").
Related entries & more 
Advertisement
pro tempore 

"temporary," Latin, literally "for the time (being)," from pro "for" (see pro-) + ablative singular of tempus "time" (see temporal). Abbreviated form pro tem is attested by 1828.

Related entries & more