| One-and-only | 12 |
| One-armed bandit | 16 |
| One-armed bandit feature | 24 |
| One-armed bandit picture | 24 |
| One-armed bandit's "mouth" | 40 |
| One-armed bandit's arm | 26 |
| One-armed bandit's gullet | 29 |
| One-armed bandit, briefly | 25 |
| One-armed bandits | 17 |
| One-armed bandits? | 18 |
| One-armed pitcher? | 18 |
| One-armed ___ | 13 |
| One-band appliances | 19 |
| One-band set | 12 |
| One-billionth of a gig | 22 |
| One-billionth: Comb. form | 25 |
| One-billionth: Prefix | 21 |
| One-by-one formation, as in walking | 35 |
| One-cell creatures | 18 |
| One-celled alga | 15 |
| One-celled animal | 17 |
| One-celled animals | 18 |
| One-celled being | 16 |
| One-celled blob | 15 |
| One-celled body | 15 |
| One-celled creature | 19 |
| One-celled creatures | 20 |
| One-celled creatures (var.) | 27 |
| One-celled critter | 18 |
| One-celled microorganisms | 25 |
| One-celled organism | 19 |
| One-celled organism (Var.) | 26 |
| One-celled organisms | 20 |
| One-celled pond dwellers | 24 |
| One-celled protozoa | 19 |
| One-celled protozoa (Var.) | 26 |
| One-celled protozoan | 20 |
| One-celled protozoan (Var.) | 27 |
| One-celled protozoans | 21 |
| One-celled swimmer | 18 |
| One-celler | 10 |
| One-cellers | 11 |
| One-cent coin | 13 |
| One-cent Tiffany issue of 2003? | 31 |
| One-chapter O.T. book | 21 |
| One-chevron G.I. | 16 |
| One-chevron G.I.'s | 22 |
| One-consonant instrument | 24 |
| One-crop nations | 16 |
| One-customer connection | 23 |
| One-customer connector | 22 |
| One-customer link | 17 |
| One-day "Jeopardy!" contestant, e.g. | 46 |
| One-day replacement, often | 26 |
| One-dimensional | 15 |
| One-dimensional figure | 22 |
| One-dimensional: Abbr. | 22 |
| One-dish dinner | 15 |
| One-dish meal | 13 |
| One-dish meals | 14 |
| One-dose containers | 19 |
| One-down four-up card game | 26 |
| One-down, four-up card game | 27 |
| One-edged sword | 15 |
| One-edged weapon | 16 |
| One-eighth gallon | 17 |
| One-eighth of a circle | 22 |
| One-eighth of a cup | 19 |
| One-eighth of a fluid ounce | 27 |
| One-eighth of a magnum | 22 |
| One-eighth of a peck | 20 |
| One-eighth of a piece of eight | 30 |
| One-eighth of an ounce | 22 |
| One-eighth of CXII | 18 |
| One-eighth ounce | 16 |
| One-eighth part | 15 |
| One-eighth pt. of a V-8 | 23 |
| One-eighth quart | 16 |
| One-eighties | 12 |
| One-eighties, in slang | 22 |
| One-eighty | 10 |
| One-eighty from NNE | 19 |
| One-eighty from NNW | 19 |
| One-eighty from SSW | 19 |
| One-eighty from WSW | 19 |
| One-eighty maneuver | 19 |
| One-eighty on the road | 22 |
| One-eighty, informally | 22 |
| One-eighty, slangily | 20 |
| One-eyed "Futurama" character | 39 |
| One-eyed "Thor" role for Anthony Hopkins | 50 |
| One-eyed Egyptian god | 21 |
| One-eyed female on 'Futurama' | 37 |
| One-eyed female on "Futurama" | 39 |
| One-eyed giant | 14 |
| One-eyed god | 12 |
| One-eyed god of myth | 20 |
| One-eyed instrument | 19 |
| One-eyed leader | 15 |
| One-eyed monster | 16 |