subcross

English

Etymology

From sub- +‎ cross.

Noun

subcross (plural subcrosses)

1. A hybrid of two hybrids.
   • 1906, R. A. McIntyre, The Game Fowl:

     He says they showed at that day a subcross, perhaps Baltimore Topknot Arrington Fowl.

   • 1941, Comparative Psychology Monographs - Volume 17, page 118:

     If it were not for this epidemic it is probable that the animals in this subcross would not have differed significantly from those in the reciprocal cross in view of the similarity in activity between the F22 reciprocal crosses.

2. (mathematics) The cross product of two cross products.
3. A crosspiece that is below something.
   • 1902, The Railway Age - Volume 33, page 78:

     In addition to the distance pieces the two subcross ties ...

4. The cross-reference of a cross-reference.
   • 1816, Congressional Serial Set, page 2624:

     It has not been felt necessary, however, to provide copious subcross-references to the subjects arranged under a main heading.

Verb

subcross (third-person singular simple present subcrosses, present participle subcrossing, simple past and past participle subcrossed)

1. To create a hybrid between two hybrids.
   • 1969, Walter Welch, Elsie A. Zuercher, The World of Little Irises: 1957-1959, no. 8-10, page 165:

     The whites subcrossed gave only whites; the blues gave blues and whites; and only the backcross with Zephir gave a single rose among blues and whites.

   • 1983, P. A. Huxley, Plant Research and Agroforestry:

     In outbreeding crops, such as many tree species, you get considerable segregation in early generations following subcrossing or inbreeding.

2. To cross below something.
   • 1957, Parliamentary Debates - Volume 27, Issues 16-29, page 2577:

     I would even suggest that the C.I.D. be asked to investigate the matter further. " There is an indecipherable signature ; this is, however, also subcrossed "AG. A., Puttalam, D/S."

   • 1989, Zhong Zheng, Shaojing Li, Marine planktology, page 60:

     Two antapical horns turn curving forward from bases, parallel to apical horn, or are subcrossed.

3. (mathematics) To calculate a subcross.
   • 2016, Tunçar Şahan, Osman Mucuk, “Normality and quotient in crossed modules, cat$^{1}$-groups and internal groupoids within groups with operations”, in arXiv‎^[1]:

     In this paper we define the notions of normal subcrossed module and quotient crossed module within groups with operations; and using the equivalence of crossed modules over groups with operations and internal groupoids we prove how normality and quotient concepts are related in these two categories.