honeycomb

in concrete, a rough, pitted surface or a surface with voids, resulting from incomplete filling of the concrete against the formwork or among the coarse aggregate. Honeycomb can be caused by using concrete that is too stiff or by not adequately consolidating the mix after it has been placed.

Alternate spellings and misspellings: honeycom, honeykom, honey comb, huneycomb, huneycome