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countable and uncountable, plural vitelli or vitelluses
(biology) The contents or substance of the ovum; egg yolk. quotations
In the sarcodo there takes place a process which may be in some measure compared with what occurs in the vitellus after the fecundation of an ovum. The granules becoming united together form groups, which soon divide and subdivide […]
1861, F. Rymer Jones, The General Structure of the Animal Kingdom, page 48
(botany) Perisperm in an early condition. examples