La-bō'ri-oüs, a.
(89), a. [Lat. laboriosus, from labor, labor; Fr. laborieux, Pr. laborios, It., Sp., & Pg. laborioso.]
Sense 1. Requiring or employing labor, perseverance, or sacrifices; toilsome; tiresome.
Dost thou love watchings, abstinence, or toil, Laborious virtues all? Learn these from Cato. Addison.
Sense 2. Devoted to labor; diligent; industrious; as, a laborious mechanic.
Laborious labor (Med.), labor or delivery that is unusually difficult and painful.