Sentence:  The bottom part of a burrow has a number of side tunnels or `` cells '' , each of which is provided with an <WSD>egg</WSD> plus a store of beebread . 
Meaning of the word marked with <WSD> tags:  animal reproductive body consisting of an ovum or embryo together with nutritive and protective envelopes; especially the thin-shelled reproductive body laid by e.g. female birds