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erythro-. erythro- or erythr- pref. 1. Red: erythrocyte. 2. Erythrocyte: erythropoiesis. [From Greek eruthros, red; see reudh- in Indo-European roots.] erythro- or erythr- combining form (Colours) red: erythrocyte. erythro- a combining form meaning âredâ (erythrocyte) or âred blood cellâ (erythropoiesis).
Pyrethrin is syntethically made by industrial methods, but it also naturally occurs in the Chrysanthemum flowers, and thus is often considered an organic insecticide, or at least when is not combined with piperonyl butoxide or other synthetic adjuvants.yrethrin is syntethically made by industrial methods, but it also naturally occurs in the Chrysanthemum flowers, and thus is often considered an organic insecticide, or at least when is not combined with piperonyl butoxide or other synthetic adjuvants.