Definitions

sandbur

sandbur

[sand-bur]
sandbur or bur grass, any species of the genus Cenchrus of the family Gramineae (grass family), sandy-soil plants of tropical and temperate regions. At maturity the sharp spines and burlike seeds make the plant a troublesome weed, especially to sheepgrowers. The name sandbur is sometimes used for the buffalo bur and the horse nettle of the family Solanaceae (nightshade family). The family Gramineae is classified in the division Magnoliophyta, class Liliopsida, order Cyperales. The Solanaceae is in the class Magnoliopsida, order Polemoniales.
or offshore bar

Submerged or partly exposed ridge of sand or coarse sediment that is built by waves offshore from a beach. The swirling turbulence of waves breaking off a beach excavates a trough in the sandy bottom. Some of this sand is carried forward onto the beach and the rest is deposited on the offshore flank of the trough. Sand suspended in the backwash and in rip currents adds to the bar, as does some sand moving shoreward from deeper water. The bar's top is kept below still-water level by the plunge of the waves breaking over it.

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