| Small particle: Abbr. | 21 |
| Particle: Abbr. | 15 |
| Unit of matter: Abbr. | 21 |
| Tiny mass: Abbr. | 16 |
| Kind of biol. | 13 |
| H2O, e.g. | 9 |
| Group of atoms: Abbr. | 21 |
| Gretchen of "Boardwalk Empire" | 40 |
| Collection of atoms: Abbr. | 26 |
| Smallest unit of an elem. | 25 |
| Smallest particle of an elem. | 29 |
| Small particle (abbr.) | 22 |
| Small matter: Abbr. | 19 |
| Particle in a cyclotron: Abbr. | 30 |
| Microphysics unit: Abbr. | 24 |
| H2O, e.g | 8 |
| Grp. of atoms | 13 |
| Group of atoms, briefly | 23 |
| Gretchen who played Bettie Page | 31 |
| Gretchen of "Rounders" | 32 |
| Gretchen of "Finding Graceland" | 41 |
| Element unit: Abbr. | 19 |
| Elem. unit | 10 |
| Cluster of atoms (Abbr.) | 24 |
| Basic unit: Abbr. | 17 |
| Atom grp. | 9 |
| Actress Gretchen of "Boardwalk Empire" | 48 |
| Grinding tooth | 14 |
| Wisdom tooth, e.g. | 18 |
| Back biter? | 11 |
| Back biter | 10 |
| Back tooth | 10 |
| Bicuspid's neighbor | 23 |
| Bicuspid neighbor | 17 |
| Wisdom tooth | 12 |
| Grinding | 8 |
| Crown spot | 10 |
| Cavity site, often | 18 |
| Canine companion? | 17 |
| Place for a crown | 17 |
| One of twelve teeth | 19 |
| It might be impacted | 20 |
| Grinder of a sort | 17 |
| Canine's kin | 16 |
| Canine companion | 16 |
| Wisdom tooth, for example | 25 |
| One of a dozen in a set of 32 | 29 |
| One may be crowned | 18 |
| Jawbreaker breaker | 18 |
| Jaw protrusion | 14 |
| It may be filled before it bites | 32 |
| It may be drilled before it's filled | 40 |
| Good for grinding | 17 |
| Food grinder | 12 |
| Filling site | 12 |
| Cheek tooth | 11 |
| Canine's relative | 21 |
| Wisdom tooth, for one | 21 |
| Wisdom tooth e.g. | 17 |
| Tooth associated with wisdom | 28 |
| Setting for a crown, perhaps | 28 |
| Plaque target | 13 |
| Place for a dental crown | 24 |
| Part of a mouthful | 18 |
| One of a human dozen | 20 |
| One of 12 grinders | 18 |
| Meat grinder, at times | 22 |
| Meat grinder | 12 |
| Mammalian grinder | 17 |
| Large grinder | 13 |
| It shouldn't be used as an icebreaker | 41 |
| First permanent tooth | 21 |
| Drilling site, maybe | 20 |
| Cuspid's neighbor | 21 |
| Certain grinder | 15 |
| Canine's cousin | 19 |
| Canine kin? | 11 |
| Canine cousin | 13 |
| Grinding teeth | 14 |
| Drilling sites | 14 |
| Certain teeth | 13 |
| Wisdom teeth | 12 |
| They really bite | 16 |
| They have more than one root | 28 |
| Cheek teeth | 11 |
| Wisdom teeth, say | 17 |
| Wisdom teeth, e.g. | 18 |
| Toddlers cut them | 17 |
| Some choppers | 13 |
| Potato mashers, at times | 24 |
| Man has 12 of these | 19 |
| Jaw teeth | 9 |
| Grinding aids | 13 |
| Certain grinders | 16 |
| Bicuspid neighbors | 18 |
| Back teeth | 10 |
| Back biters? | 12 |
| Adults have 12 | 14 |
| Adult's dozen | 17 |
| Adult humans have 12 of these | 29 |