umbrellaradj.
/ʌmˈbrɛlə/, U.S. /ˌəmˈbrɛlər/ Zoology.
Of or relating to the umbrella (umbrella n. 7b) of a medusoid cnidarian (jellyfish).
ΚΠ
1838 G. Johnston in Trans. Nat. Hist. Soc. Northumberland 2 242 Lucernaria. Body anomalous, adhering by a narrow stalk; mouth in the centre of an umbrellar expansion.
1880 Q. Jrnl. Microsc. Sci. 20 355 They are situated near the umbrellar margin of the velum, between the bases of the tentacles.
1938 Physiol. Zool. 11 124 In toxic solutions the umbrellar margin and manubrial end are the most susceptible.
2006 Limnol. & Oceanogr. 51 1105/1 A thrust was produced that shifted the umbrellar axis and counteracted the rotational force.
This is a new entry (OED Third Edition, December 2013; most recently modified version published online March 2022).
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adj.1838