different between polytypism vs polytype

English

Etymology

poly- +? type +? -ism

Noun

polytypism (countable and uncountable, plural polytypisms)

1. The existence of multiple types, especially of multiple subspecies.
2. (of crystals) The existence of multiple forms differing in only one of the dimensions of the unit cell.

English

Etymology

poly- +? type

Noun

polytype (plural polytypes)

1. Any of the types involved in polytypism.

2. A cast, or facsimile copy, of an engraved block, matter in type, etc.
   • 1825, Thomas Curson Hansard, Typographia, an Historical Sketch of the Origin and Progress of the Art of Printing

     Towards the end of the eighteenth century , Professor Wilson of Glasgow , being engaged in a series of experiments for making etchings upon glass with fluoric acid for the purposes of art , thought it possible to make polytypes of glass from engraved copperplates

3. (computing theory) In the Hindley–Milner type system, a data type containing variables bound by one or more ? (for-all) quantifiers.

   Coordinate term: monotype

Verb

polytype (third-person singular simple present polytypes, present participle polytyping, simple past and past participle polytyped)

1. (transitive) To produce a polytype of.

   to polytype an engraving

French

Pronunciation

• Homophones: polytypent, polytypes

Verb

polytype

1. first-person singular present indicative of polytyper
2. third-person singular present indicative of polytyper
3. first-person singular present subjunctive of polytyper
4. third-person singular present subjunctive of polytyper
5. second-person singular imperative of polytyper