rock kelp
now rare
noun
= rockweed.
Origin
Mid 19th century.
- president pro tem
- president pro tempore
- presidentress
- cotton gin
- cotton grass
- cotton lavender
- cotton-leaf worm
- cottonmouth
- cottonmouth moccasin
- cotton-picking
- cotton plant
- cotton rat
- cottonseed
- cotton spinner
- cotton stainer
- cotton state
- cotton swab
- cottontail
- cotton waste
- cottonweed
- cottonwood
- cotton wool
- cottony
- cottony-cushion scale
- cotyledon