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WordReference Random House Learner's Dictionary of American English © 2024spine /spaɪn/USA pronunciation n. - Anatomy[countable] the backbone;
spinal column. - Botany[countable]
- a hard, sharp-pointed outgrowth on a plant;
thorn. - a stiff-pointed bone or part of a bodily structure of an animal, such as the quill of a porcupine.
- [uncountable] courage;
mettle. - Printing[countable] the back of a book binding, usually indicating the title and author.
spin•y, adj., -i•er, -i•est:I stuck my finger on one of the fish's spiny fins. WordReference Random House Unabridged Dictionary of American English © 2024spine (spīn),USA pronunciation n. - Anatomy, Zoologythe spinal or vertebral column;
backbone. - Anatomy, Zoologyany backbonelike part.
- Zoologya stiff, pointed process or appendage on an animal, as a quill of a porcupine, or a sharp, bony ray in the fin of a fish.
- something, as a quality or trait, that constitutes a principal strength;
resolution;
stamina;
backbone:a situation that would test a person's spine. - a ridge, as of ground or rock.
- Botanya sharp-pointed, hard or woody outgrowth on a plant;
thorn. - Printing[Bookbinding.]the back of a book cover or binding, usually indicating the title and author.
- Latin spīna thorn, backbone
- late Middle English 1400–50
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