Entry 1 sense Webster, 1913 Pharos /fĕr'-ōzˌ/ · Pha·ros · IPA /ˈfɛəɹɒs/ 01 n. A lighthouse or beacon for the guidance of seamen. 1. A lighthouse or beacon for the guidance of seamen. “He . . . built a pharos, or lighthouse.” — Arbuthnot.