nidamental

from The Century Dictionary.

• Protective of eggs, embryos, or young; covering or containing such objects; secreting an egg-case or capsule: thus, a bird's nest is nidamental with respect to the eggs and young.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Zoöl.) Of, pertaining to, or bearing, eggs or egg capsules. See Illust. of dibranchiata.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective anatomy Used to describe an internal organ, in some elasmobranchs and molluscs, that secretes egg cases or the gelatinous covering of eggmass.