| a combining form occurring in loanwords from Greek, meaning “five” (Pentateuch); on this model, used in the formation of compound words (pentavalent). |
| penta- or pent- pref. Five: pentamerous. [Greek, from pente, five; see penkwe in Indo-European roots.] |
penta- or pent-
pref.
Five: pentameter.
Containing five atoms, molecules, or groups: pentose.