1
a
: any of an order (Araneae synonym Araneida) of arachnids having a short, usually unsegmented abdomen linked to the cephalothorax by the pedicel, chelicerae modified into poison fangs, and two or more pairs of spinnerets at the posterior end of the abdomen for spinning threads of silk for various uses (as in making cocoons for their eggs or webs to catch prey)
Note: Spiders are further characterized by leglike pedipalps near the mouth, usually eight simple eyes, and book lungs or tracheae in the abdomen.
b
: any of various other arthropods and especially arachnids that resemble the true spiders
—not used technically
2
: a cast-iron frying pan originally made with short feet to stand among coals on the hearth
3
: any of various devices consisting of a frame or skeleton with radiating arms or members
Examples of spider in a Sentence
We watched the spider spin its web.
Recent Examples on the Web
But unlike at some jungle retreats, which demand a certain ability to rough it, even the most spider-averse will feel at home here—kids in particular.
—
Condé Nast, Condé Nast Traveler, 29 Mar. 2026
For those who spot a Joro spider in a new area, experts suggest logging the sighting on apps like iNaturalist to help researchers track their northern migration.
—Khloe Quill, FOXNews.com, 27 Mar. 2026
How did the spiders get to the US, and what’s their life cycle like?
—Saleen Martin, USA Today, 26 Mar. 2026
Making matters worse, Richmond argues, Barrington’s logo for Cleveland Spiders features an image of a spider, which the university also uses in connection with its marks.
—Michael McCann, Sportico.com, 17 Mar. 2026
See All Example Sentences for spider
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Condé Nast, Condé Nast Traveler, 29 Mar. 2026
For those who spot a Joro spider in a new area, experts suggest logging the sighting on apps like iNaturalist to help researchers track their northern migration.
—Khloe Quill, FOXNews.com, 27 Mar. 2026
How did the spiders get to the US, and what’s their life cycle like?
—Saleen Martin, USA Today, 26 Mar. 2026
Making matters worse, Richmond argues, Barrington’s logo for Cleveland Spiders features an image of a spider, which the university also uses in connection with its marks.
—Michael McCann, Sportico.com, 17 Mar. 2026
See All Example Sentences for spider
Cite this Entry
“Spider.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/spider. Accessed 3 Apr. 2026.
Copy CitationKids Definition
spider
noun
spi·der
ˈspīd-ər 
1
: any of an order of arachnids that have two or more pairs of abdominal organs for spinning threads of silk used in making cocoons for their eggs, nests for themselves, or webs for catching their prey
2
: a cast-iron frying pan
Medical Definition
spider
noun
spi·der
ˈspīd-ər
1
: any of an order (Araneae synonym Araneida) of arachnids having a body with two main divisions, four pairs of walking legs, and two or more pairs of abdominal spinnerets for spinning threads of silk used especially in making webs for catching prey
2
: spider nevus
an arterial spider
3
: an obstruction in the teat of a cow
especially
: a small irregular horny growth resulting from irritation or bruising
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