| DISULFOTON | • disulfoton n. A highly toxic organothiophosphate insecticide and acaricide, O,O-diethyl S-2-ethylthioethyl phosphorodithioate. • DISULFOTON n. an organophosphorus systemic insecticide. |
| FETOLOGIES | • FETOLOGY n. a branch of medicine dealing with the fetus. |
| FETOLOGIST | • fetologist n. One who studies fetology. • FETOLOGIST n. one who studies the fetus. |
| FIELDBOOTS | • fieldboots n. Plural of fieldboot. • field␣boots n. Plural of field boot. • FIELDBOOT n. a knee-length boot. |
| FLOODTIDES | • floodtides n. Plural of floodtide. • flood-tides n. Plural of flood-tide. • flood␣tides n. Plural of flood tide. |
| FLOTATIONS | • flotations n. Plural of flotation. • FLOTATION n. the act of floating, also FLOATATION. |
| FOLIATIONS | • foliations n. Plural of foliation. • FOLIATION n. the process of bursting into leaf. |
| FOLKLORIST | • folklorist n. A person who studies or collects folklore. • FOLKLORIST n. a student of folklore. |
| FOOLISHEST | • foolishest adj. Superlative form of foolish: most foolish. • FOOLISH adj. lacking good sense or judgement. |
| FOOTLIGHTS | • footlights n. Plural of footlight. • foot-lights n. Plural of foot-light. • FOOTLIGHT n. one of a row of lights along the front of a theatre stage. |
| FRITHSTOOL | • frithstool n. (Historical) An Anglo-Saxon stone seat, placed near the altar of a church, which afforded protection… • frith␣stool n. Alternative form of frithstool. • FRITHSTOOL n. a seat in churches near the altar, to which offenders formerly fled for sanctuary. |
| OLFACTIONS | • olfactions n. Plural of olfaction. • OLFACTION n. the act of perceiving by smell. |
| PORTFOLIOS | • portfolios n. Plural of portfolio. • PORTFOLIO n. a case or pair of boards for holding loose papers. |
| SINGLEFOOT | • singlefoot n. A horse’s gait, a cross between a pace and a trot, in which the two legs of one side are raised almost… • singlefoot v. (Intransitive) To proceed by means of the singlefoot gait. |
| TOMFOOLISH | • tomfoolish adj. Silly; foolish. • TOMFOOLISH adj. foolish. |
| UFOLOGISTS | • ufologists n. Plural of ufologist. • UFOLOGIST n. one interested in ufos. |