Merriam-Webster Collegiate Dictionary - trabecula

 noun  (plural ~e; also -las)  Etymology: New Latin, from Latin, little beam, diminutive of trabs, trabes beam  Date: circa 1866  1. a small bar, rod, bundle of fibers, or septal membrane in the framework of a body organ or part  2. a fold, ridge, or bar projecting into or extending from a plant part; especially a row of cells bridging an intercellular space  • ~r adjective  • ~te adjective