pec·tus/ˈpɛk.tʊs/Latin · noun · neuter
"Pectus" in Latin literally means chest or breast — the front of the torso between the neck and abdomen. It's a third-declension neuter noun (genitive: pectoris), which is why English derivatives like pectoral carry that "-or-" stem.
But the more interesting part is its figurative range. Romans located thought, feeling, and character in the chest rather than the head or heart, so pectus extended well beyond anatomy:
- Soul / inner self the seat of emotions and passions
- Mind / intellect the faculty of thought and judgment (Cicero uses it this way constantly)
- Courage / spirit as in having "heart" for something
- Character a person's moral core
So when Virgil or Cicero writes pectus, the reader has to feel out from context whether it's the literal chest, someone's feelings, their reasoning mind, or their underlying character. A phrase like toto pectore ("with the whole chest") means wholeheartedly, with complete commitment — body, mind, and soul fused.
Etymology
Etymologically it traces to a Proto-Indo-European root meaning something like "breast" or possibly "to comb / pluck" (debated — some link it to pectere, to comb, via the idea of the ribcage's structure, but this is contested).
Where it surfaces today
Modern descendants: pectoral (muscle, cross), expectorate (literally "to push out of the chest"), Italian petto, Spanish pecho, French pis. And in medicine, pectus excavatum and pectus carinatum — the sunken-chest and pigeon-chest deformities — keep the literal anatomical sense alive.
The word's real charm is that the Romans didn't separate thinking from feeling from being brave the way we do. All of it lived in the pectus.
And so we develop apps, frameworks, extensions and lives… from pectus.