Other Conditions Causing Yellow Toenails. Although fungal infection is the most likely cause of yellow toenails, rarely, some other disease conditions can also result in yellow toenails. Some of these conditions are psoriasis, jaundice, paronychia, lymphedema, bronchiectasis, tuberculosis and sinusitis.
1. a plant or animal that lives upon or within another living organism at whose expense it obtains some advantage; see symbiosis. 2. the smaller, less complete member of asymmetrical conjoined twins, attached to and dependent upon the autosite.parasitÂ´ic. malarial parasite Plasmodium.
1 The relationship between two different species of organisms that are interdependent; each gains benefits from the other. 2  A relationship between different species where both of the organisms in question benefit from the presence of the other.ymbiosis. 1  Anton de Bary's original definition says: a long-term relationship between two different species. 2  To this can be added, mutualism, (benefit for both), commensalism (benefit for one neutral for the other) and parasitism (benefit for one, costly for the other).