sclerenchyme

Noun

sclerenchyma (countable and uncountable, plural sclerenchymas or sclerenchymata)

1. A mechanical ground tissue, impermeable to water, which consists of cells having narrow lumen and thick, mineralized walls of lignin; present in stems, vascular bundles (of monocots), seed coverings, and vein and tips of leaves.
2. The hard calcareous deposit in the tissues of the stony corals (Anthozoa).