| Periods | 7 |
| Periodontists' org. | 23 |
| Periodontists' grp. | 23 |
| Periodontist's recommendation | 33 |
| Periodontist's org. | 23 |
| Periodontist's grp. | 23 |
| Periodontist's focus | 24 |
| Periodontist's deg. | 23 |
| Periodontist's concerns | 27 |
| Periodontist's concern | 26 |
| Periodontal concerns | 20 |
| Periodontal concern | 19 |
| Periodonist's concern | 25 |
| Periodicals, for short | 22 |
| Periodicals, briefly | 20 |
| Periodicals with unturnable pages | 33 |
| Periodicals on a PC | 19 |
| Periodicals not brought by a postal carrier | 43 |
| Periodicals | 11 |
| Periodically war-torn Turkish city | 34 |
| Periodically rising and falling | 31 |
| Periodically flowing and ebbing | 31 |
| Periodically available fast food item | 37 |
| Periodically | 12 |
| Periodical: Abbr. | 17 |
| Periodical, informally | 22 |
| Periodical, for short | 21 |
| Periodical, briefly | 19 |
| Periodical's bias | 21 |
| Periodical without a dead-tree version | 38 |
| Periodical with the tagline "A home doesn't need to be big, just smart" | 85 |
| Periodical with a URL | 21 |
| Periodical with 0% home subscription rates? | 43 |
| Periodical where you can find a Jerker desk or Fartfull workbench | 65 |
| Periodical table abbr. | 22 |
| Periodical put out by the same parent company | 45 |
| Periodical publisher | 20 |
| Periodical published in America? | 32 |
| Periodical plea | 15 |
| Periodical periodical contributor | 33 |
| Periodical output: Abbr. | 24 |
| Periodical opinion piece | 24 |
| Periodical on an iPad | 21 |
| Periodical of haute couture | 27 |
| Periodical number | 17 |
| Periodical named after the Greek god of satire? | 47 |
| Periodical item | 15 |
| Periodical issued twelve times a year | 37 |
| Periodical for fruit drink makers? | 34 |
| Periodical focused solely on basketball's Baylor? | 53 |
| Periodical figure | 17 |
| Periodical dedicated to stylish boots? | 38 |
| Periodical changers: Abbr. | 26 |
| Periodical by and for enthusiasts | 33 |
| Periodical author | 17 |
| Periodical addendum | 19 |
| Periodical accessed by a URL | 28 |
| Periodical | 10 |
| Periodic-table listing: Abbr. | 29 |
| Periodic-table listing | 22 |
| Periodic-table item | 19 |
| Periodic-table entries | 22 |
| Periodic-table component | 24 |
| Periodic White House event | 26 |
| Periodic weather disruption | 27 |
| Periodic visitor | 16 |
| Periodic table's no. 10 | 27 |
| Periodic table suffix | 21 |
| Periodic table stat. | 20 |
| Periodic table stat | 19 |
| Periodic table period? | 22 |
| Periodic table no. | 18 |
| Periodic table neighbor of manganese | 36 |
| Periodic table neighbor of cobalt | 33 |
| Periodic table listings | 23 |
| Periodic table listing | 22 |
| Periodic table items | 20 |
| Periodic table info: Abbr. | 26 |
| Periodic table info | 19 |
| Periodic table figs. | 20 |
| Periodic table fig. | 19 |
| Periodic table entry (Abbr.) | 28 |
| Periodic table entry | 20 |
| Periodic table developer | 24 |
| Periodic table datum, briefly | 29 |
| Periodic table creator Mendeleev | 32 |
| Periodic table abbr. | 20 |
| Periodic source of weird weather | 32 |
| Periodic riser | 14 |
| Periodic review | 15 |
| Periodic record | 15 |
| Periodic radio signal | 21 |
| Periodic produce outbreak | 25 |
| Periodic payments | 17 |
| Periodic payment | 16 |
| Periodic pay | 12 |
| Periodic Pacific disruption | 27 |
| Periodic oscillation | 20 |
| Periodic obligations | 20 |
| Periodic monster | 16 |