an acorn-shaped variety of winter squash, growing to 18 inches (46 cm) long and 14 inches (36 cm) in diameter, having a dark-green to orange-yellow skin and yellow to orange flesh.
- Acorn sugar
- Acorn tube
a vacuum tube, resembling an acorn in size and shape, used chiefly in ultrahigh-frequency electronic devices.
- Acorn valve
noun a small electronic valve, approximately acorn-shaped with small closely-spaced electrodes, used in ultrahigh-frequency applications
- Acorn worm
any of several burrowing, often brilliantly colored hemichordates of the class Enteropneusta, usually found in intertidal sand and mud, having an acorn-shaped proboscis and collar. noun any of various small burrowing marine animals of the genus Balanoglossus and related genera, having an elongated wormlike body with an acorn-shaped eversible proboscis at the head end: subphylum […]