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[per-uh-luh s] /ˈpɛr ə ləs/

involving or full of grave risk or ; hazardous; dangerous:
a perilous voyage across the Atlantic in a small boat.
very hazardous or dangerous: a perilous journey

c.1300, from Old French perillos “perilous, dangerous” (Modern French périlleux) “dangerous, hazardous,” from Latin periculosus “dangerous, hazardous,” from periculum “a danger, attempt, risk” (see peril). Related: Perilously; perilousness.


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  • Peril-point

    noun 1. the lower limit of a tariff on a commodity at which import of that commodity would have a seriously adverse effect on the local producers.

  • Perilune

    [per-i-loon] /ˈpɛr ɪˌlun/ noun 1. the point in a lunar orbit that is nearest to the moon. /ˈpɛrɪˌluːn/ noun 1. the point in a lunar orbit when a spacecraft launched from the moon is nearest the moon Compare apolune, pericynthion perilune (pěr’ĭ-ln’) The point at which an object orbiting the Moon, such as an artificial […]

  • Perilymph

    [per-i-limf] /ˈpɛr ɪˌlɪmf/ noun, Anatomy. 1. the fluid between the bony and membranous labyrinths of the ear. /ˈpɛrɪˌlɪmf/ noun 1. the fluid filling the space between the membranous and bony labyrinths of the internal ear perilymph per·i·lymph (pěr’ə-lĭmf’) n. The fluid in the space between the membranous and bony labyrinths of the inner ear.

  • Perilymphangitis

    perilymphangitis per·i·lym·phan·gi·tis (pěr’ə-lĭm’fān-jī’tĭs) n. Inflammation of tissues surrounding a lymphatic vessel.

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