| abyss | (noun) a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below (often used figuratively) | Synonyms: abysm |
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| abyssal | (adjective) relating to ocean depths from 2000 to 5000 meters | - |
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| (adjective) resembling an abyss in depth; so deep as to be unmeasurable | Synonyms: abysmal, unfathomable |
| alyssum | (noun) any garden plant of the genus Alyssum having clusters of small yellow or white flowers | Synonyms: madwort |
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| byssus | (noun) tuft of strong filaments by which e.g. a mussel makes itself fast to a fixed surface | Synonyms: beard |
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| dyssynergia | (noun) inability to coordinate voluntary muscle movements; unsteady movements and staggering gait | Synonyms: ataxia, ataxy, motor ataxia |
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| hyssop | (noun) bitter leaves used sparingly in salads; dried flowers used in soups and tisanes | - |
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| (noun) a European mint with aromatic and pungent leaves used in perfumery and as a seasoning in cookery; often cultivated as a remedy for bruises; yields hyssop oil | Synonyms: Hyssopus officinalis |
| lyssa | (noun) an acute viral disease of the nervous system of warm-blooded animals (usually transmitted by the bite of a rabid animal); rabies is fatal if the virus reaches the brain | Synonyms: hydrophobia, madness, rabies |
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| lyssavirus | (noun) a neurotropic non-arbovirus of the family Rhabdoviridae that causes rabies | - |
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| odyssey | (noun) a long wandering and eventful journey | - |
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| vichyssoise | (noun) a creamy potato soup flavored with leeks and onions; usually served cold | - |
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