The ozone layer; a region of the stratosphere containing a relatively high concentration of ozone.

plural of shield fern

Any of the scales found on the underside of a snake's head towards the anterior and touching the lower labial scales.

Dryopteris (buckler ferns) / Lastreopsis spp. / Polystichum spp.

plural of shielded cable

A pad affixed temporarily to a dress or other garment, inside the armpit, to prevent the garment's becoming wet or soiled from perspiration.

(volcanology) A large volcano, with shallow-sloping sides and a flattened dome, formed of successive eruptions of free-flowing lava from fissure vents.

A pop filter.

An area of very old bedrock surrounding Hudson Bay, and covering about half the land area of Canada.

Civilians deliberately placed in or around combat targets to deter an enemy from attacking those targets.