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erythrocytosis
erythrocytosis n. 
/ᵻˌrɪθrə(ʊ)sᵻˈtəʊsɪs/, /əˌrɪθroʊsəˈtoʊsəs/, /iˌrɪθroʊˌsaɪˈtoʊsəs/, /iˌrɪθroʊsəˈtoʊsəs/, /ᵻˌriθroʊˌsaɪˈtoʊsəs/, /ᵻˌriθroʊsəˈtoʊsəs/ erythræmia, esp. when a secondary condition resulting from some other disturbance.
Brit. /ᵻˌrɪθrə(ʊ)sʌɪˈtəʊsɪs/
, /ᵻˌrɪθrə(ʊ)sʌɪˈtəʊsɪs//ᵻˌrɪθrə(ʊ)sᵻˈtəʊsɪs/U.S. /əˌrɪθroʊˌsaɪˈtoʊsəs/
, /əˌrɪθroʊˌsaɪˈtoʊsəs//əˌrɪθroʊsəˈtoʊsəs//iˌrɪθroʊˌsaɪˈtoʊsəs//iˌrɪθroʊsəˈtoʊsəs//ᵻˌriθroʊˌsaɪˈtoʊsəs//ᵻˌriθroʊsəˈtoʊsəs/ΚΠ
1908 Practitioner Feb. 238 It would almost seem better to bring the nomenclature of this new disease into line with that adopted to describe an increase of the various forms of leucocytes, and to call it polycythæmia rubra, erythrocytosis, or, better still, erythrocythæmia.
1966 G. P. Wright & W. S. Symmers Systemic Pathol. I. iv. 175 The number of red cells in the blood is seldom as large in erythrocytosis as in polycythæmia vera.
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