What does costated mean?
"Costated" is a technical adjective meaning ribbed — that is, bearing ribs or prominent, roughly parallel ridges that resemble ribs. It is encountered chiefly in botany, where it describes leaves or stems with strong veins standing out from the surface, and in zoology and palaeontology, where it characterises shells, corals, or fossils marked by raised longitudinal lines. A brachiopod shell described as "strongly costated", for example, has pronounced ribbing running across its valve. The word derives from Latin "costa", meaning rib, which also gives us "intercostal" (between the ribs) and "costal" (relating to the ribs). Because it belongs to formal descriptive language, "costated" rarely appears outside scientific literature; readers are most likely to meet it in field guides, taxonomic descriptions, or museum labels, where precision about surface texture matters.
adjectiveHaving ribs or rib-like ridges; marked or structured with prominent parallel lines resembling ribs, especially of leaves, shells, or other natural forms.
- Having ribs or rib-like ridges, as in botany and conchology describing leaves, shells, or stems with prominent parallel veins or raised lines.
"The fossil leaf was strikingly costated, its surface crossed by thick veins radiating from a central midrib."
"The brachiopod shell was strongly costated, each rib running from hinge to margin."
"Botanists noted that the species could be distinguished by its finely costated leaves."
That word on your seashell's museum label — 'costated' — is just Latin for 'ribbed', borrowed straight from 'costa', the Latin word for both a rib and a coastline.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of costated
"Costated" comes from Latin "costa", meaning rib, through the adjective "costatus", meaning furnished with ribs. English adopted it as part of the vocabulary of scientific description, particularly in botany and conchology, where precise terms for ribbed surfaces were needed. The same Latin root produced "costal" and "intercostal" in anatomical usage, making these words true relatives sharing the rib imagery at their core.
How costated is actually used
A technical term used mainly in botany, zoology (especially conchology and palaeontology), and descriptive anatomy. It carries no emotional connotation and appears almost exclusively in formal scientific writing rather than everyday speech.
Easily confused with costated
'Coasted' is the past tense of the verb 'to coast' (to move without effort or to slide), whereas 'costated' is an adjective meaning ribbed or having rib-like ridges.