Portland screw
noun
A hollow cast of the spiral shell of the gastropod Aptyxiella portlandica, as found in Portland stone.
Origin
Late 19th century; earliest use found in Charles Lyell (1797–1875), geologist.
- infecund
- infecundity
- infeed
- infelicitous
- infelicitously
- infelicity
- infer
- inferable
- inference
- inferential
- inferentially
- inferior
- inferior conjunction
- inferiority
- inferiority complex
- inferiorly
- inferior olivary eminence
- inferior planet
- infernal
- infernally
- inferno
- infertile
- infertility
- infertility clinic
- infertility treatment