Meaning

noun rod-shaped structures of fibrous tissue that divide an organ into parts (as in the penis) or stabilize the structure of an organ (as in the spleen)

originEtymology tree Proto-Indo-European *treb-der. Proto-Italic *trabs Latin trabs Proto-Indo-European *-lós Proto-Indo-European *-elós Proto-Italic *-elos Proto-Italic *-kelos Latin -cula Latin trabēculalbor. English trabecula Learned borrowing from Latin trabēcula (“small beam”), diminutive of trabs (“beam, timber”).

Etymology from Wiktionary, CC BY-SA 3.0