extenuate v. [L. ex, out of; tenuis, thin] To make or become thin or slender; to diminish.
exterior a. [L. exterus, out] Situated away from the central axis; outward; outside.
exterior skeletal wall (BRYO: Gymnolaemata) In Cheilostomata, a skeletal wall which calcifies against the cuticle; the membrane forming this wall expands the coelomic volume of the colony.
exterior wall (BRYO) Body wall that increases the size of the zooid body and colony.
external a. [L. exterus, outside] Outward; that part away from the center of the body.
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