umbonal

[ uhm-buh-nl ]

adjective

1. having the shape or appearance of an umbo; bosslike:

   an umbonal structure.

2. of, relating to, or near the umbo:

   the umbonal region.

Other Words From

• post·umbo·nal adjective
• pre·umbo·nal adjective
• sub·umbo·nal adjective

Word History and Origins

Origin of umbonal¹

1850–55; < Latin umbōn- (stem of umbō; umbo ) + -al ¹

Example Sentences

In the Trimerellidae, for example, some of the muscles are attached to a massive or vaulted platform situated in the medio-longitudinal region of the posterior half or umbonal portion of both valves.

From Project Gutenberg

Of the shell 364 or valvular muscles W. King makes out five pairs and an odd one, and individualizes their respective functions as follows:—Three pairs are lateral, having their members limited to the sides of the shell; one pair are transmedians, each member passing across the middle of the reverse side of the shell, while the odd muscle occupies the umbonal cavity.

From Project Gutenberg

Right-hand scutum alone furnished with an internal umbonal tooth: uppermost part of peduncle dark-coloured.

From Project Gutenberg

Valves 5; carina with a truncated and crested base; scuta with strong internal umbonal teeth; terga with the basal point truncated, almost parallel to the occludent margin.

From Project Gutenberg

Valves smooth, thin, brittle; scuta with internal umbonal teeth on both sides.

From Project Gutenberg