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1-11 of 11 possibilities

process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg acrosome
operative serving as a penetration into an intelligence target agent-in-place
injury by the penetration of teeth bite
penetration of a barrier such as an enemy's defense breakthrough
strong wrapping paper that resists penetration by blood or meat fluids butcher paper
membrane that forms around a fertilized ovum and prevents penetration by additional spermatozoon fertilization membrane
process in which individuals (or small groups) penetrate an area (especially the military penetration of enemy positions without detection) infiltration
mutual penetration; diffusion of each through the other interpenetration , permeation
mature ovum after penetration by sperm but before the formation of a zygote ootid
sexual stimulation without vaginal penetration outercourse
lack of penetration or subtlety simple mindedness , simpleness , simplicity
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