Cotyledon. Definition. noun, plural: cotyledons. (1) (botany) The primary or rudimentary leaf of the embryo of a seed plant that either remains in the seed or emerges upon seed germination; a modified leaf that is part of the plant embryo within the seed; a seed leaf.otyledon. Definition. noun, plural: cotyledons. (1) (botany) The primary or rudimentary leaf of the embryo of a seed plant that either remains in the seed or emerges upon seed germination; a modified leaf that is part of the plant embryo within the seed; a seed leaf.
noun, plural: habitats. (1) Place where an organism or a biological population normally lives or occurs. (2) The location or environment where an organism (or a thing) is most likely to be found, e.g. the body part of the host of a parasite as in the scalp of the host is the habitat of a head louse.
habitat. n. 1. (Biology) the environment in which an animal or plant normally lives or grows. 2. (Sociology) the place in which a person, group, class, etc, is normally found.[C18: from Latin: it inhabits, from habitÄre to dwell, from habÄre to have].abâ¢iâ¢tat. 1. the natural environment of an organism; place that is natural for the life and growth of an organism: a jungle habitat. 2. the place where one is usu. found. 3. a special environment for living in over an extended period, as an underwater research vessel.