different between midrib vs pinnatisect

English

mid- +? rib

midrib (plural midribs)

(botany) The strengthened vein down the middle of a flower petal or simple leaf or leaflet.
Synonyms: middle rib, midvein
(botany) The continuation of the petiole of a pinnately compound leaf around which the leaflets attach.
Synonyms: middle rib, rachis

From New Latin pinnatisectus, from Latin pinnatus (“feathered”) + sectum, past participle of seco (“to cut”)

pinnatisect (not comparable)

(botany, of leaves) Having lobes with incisions that extend almost, or up to midrib.

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