13-letter words containing f, e, r, o, s, i
- superfetation — the fertilization of an ovum in a female mammal already pregnant.
- surface noise — extraneous noise caused by physical wear or a physical flaw on a phonograph record or in a pickup system, rather than by a flaw in the equipment.
- telescopiform — having body parts which resemble a telescope in that the retract within one another
- testificatory — related to a person who witnesses or an object used as evidence
- transfrontier — the part of a country that borders another country; boundary; border.
- umbelliferous — bearing an umbel or umbels.
- unforeskinned — circumcised
- unpersonified — to attribute human nature or character to (an inanimate object or an abstraction), as in speech or writing.
- versification — the act of versifying.
- virgin forest — a forest in its natural state, before it has been explored or exploited by man
- words fail me — I am too happy, sad, amazed, etc, to express my thoughts
- yorkshire fog — a common tufted grass, Holcus lanatus, having downy leaves and flower heads that are white or pink and branched, with spikelets carrying the flowers
- zf expression — (programming) (After Zermelo Fränkel set theory). David Turner's name for list comprehension.