-petalcomb. form
Primary stress is attracted either to the syllable immediately preceding this combining form or to the first syllable of this combining form. Vowels may be reduced accordingly. See e.g.
acropetal adj.,
nucleopetal adj.Origin: A borrowing from Latin, combined with an English element. Etymons: Latin petere , -al suffix1.
Etymology: < classical Latin petere to seek (see repeat v.) + -al suffix1, apparently largely after centripetal adj.Apparently earliest in the early 19th cent. in the non-technical formation ventripetal adj. at ventri- comb. form . Subsequently in the later 19th cent. in a small number of botanical formations, as acropetal adj., basipetal adj., etc. Compare also psychopetal adj. at psycho- comb. form . Apparently also in Romipetal adj., although this probably has a Latin model.
This is a new entry (OED Third Edition, December 2005; most recently modified version published online March 2020).