Princeton's WordNet(1.00 / 2 votes)Rate this definition: Wiktionary(2.67 / 3 votes)Rate this definition: infinity(Noun) Limitlessness, unlimitedness, something which is growing without limits or bounds. infinity(Noun) A number that has an infinite numerical value that cannot be counted.
univalve (mollusk) a class of mollusks typically having a 1-piece coiled shell and flattened muscular foot with a head bearing stalked eyes. animal noun (animals and microorganisms) univalves.
Unicellular organisms consist of one general cell under which all activities are housed. In animals, the development of embryos can be divided into three phases; cleavage, gastrulation and organogeny. During cleavage, the zygote undergoes repeated mitotic division to form a hollow ball of cells.