eye tube
noun
1The tube of the eyepiece in a telescope or microscope.
2 Zoology a tubular eye found in jumping spiders, containing a series of lenses and four layers of photoreceptors.
Origin
Mid 18th century; earliest use found in Nevil Maskelyne (1732–1811), astronomer and mathematician.
- greying out
- grey iron
- greyish
- grey jay
- grey kangaroo
- grey knight
- Grey, Lady Jane
- greylag
- greylag goose
- grey leaf
- grey level
- grey liberation
- grey linnet
- grey literature
- greylord
- greyly
- greymail
- grey manganese
- grey mare
- grey market
- grey marketeer
- grey marketeering
- grey marketer
- grey marketing
- grey matter