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pleomorphic, a.|pliːəʊˈmɔːfɪk|
[f. pleo-, pleio- + Gr. µορϕή form + -ic.]
Having more than one form: (a) Biol., exhibiting different forms at different stages of the life-history, as certain bacteria and parasitic fungi; pleiomorphic; (b) Chem. and Min. crystallizing in two or more fundamentally different forms; polymorphic. So pleoˈmorphism, the fact or condition of thus exhibiting a plurality of forms: (a) = pleiomorphism; (b) = polymorphism; pleoˈmorphist, an advocate of a theory of pleomorphism; pleoˈmorphous a. = pleomorphic; ˈpleomorphy = pleomorphism.
1886E. R. Lankester in Nature 4 Mar. 413/2, I gave the name Bacterium rubescens to this *pleomorphic, or, as I termed it, ‘Protean’, species.
1864Webster, *Pleomorphism, the property of crystallizing under two or more distinct fundamental forms,..said of various substances, as carbon, which occurs in octahedral and related forms in the diamond, and in hexagonal prisms in graphite. 1876tr. Wagner's Gen. Pathol. (ed. 6) 86 Upon this depends the so-called pleomorphism. 1884Nature 4 Sept. 433/2 The then recent discoveries of Pleomorphism and the reproductive organs..were leading mycologists to suspect that a reproductive process exists in the case of all the higher Fungi.
1887Athenæum 6 Aug. 184/3 When De Bary discovered and demonstrated the wonderful fact of heterœcism..it is not astonishing that many saw in this the way to crown the wildest conjectures of the *pleomorphists of the day.
1864Webster, *Pleomorphous, having the property of pleomorphism.
1882Vines Sachs' Bot. 232 The erroneous theory of so-called *Pleomorphy among Fungi was the result of a defective perception of the true nature of the different kinds of reproductive organs on which the common name of Spore had been bestowed.
Add: (c) Path., (consisting) of or designating a (usu. benign) tumour, esp. an adenoma of the salivary glands, which contains a mixture of several cell types and different kinds of neoplastic tissue.
1948R. A. Willis Path. Tumours xvii. 321 (heading) Pleomorphic salivary adenomas and adenocarcinomas (so-called ‘mixed tumours’). Ibid. 322 Some workers..have retained the term ‘mixed’ as appropriately denoting the variety of structure in the growths... I prefer to discard it in favour of the purely descriptive adjective ‘pleomorphic’. 1954S. Duke-Elder Parsons' Dis. Eye (ed. 12) xxxiii. 545 Tumours of the lacrimal gland show a very marked resemblance to those of the parotid. Much the commonest is a pleomorphic adenocarcinoma, frequently characterized histologically by myxomatous material (the so-called ‘mixed tumour’). 1987Oxf. Textbk. Med. (ed. 2) I. vi. 159/2 Epithelial tumours of the lung have been most frequent but anaplastic and pleomorphic growths have also been seen. |