Did you maybe mean one of these? sanitize, subsidize, subtile
Definitions
Wiktionary
- v. transitive to judge (the number of objects in a group) rapidly, accurately and confidently without counting them
- v. intransitive to have the ability of judging the number of objects in a group in this way
Etymologies
- From Latin subitus ("sudden; unexpected") from the feeling of immediately knowing the number of items present. (Wiktionary)
Examples
“Specifically, people and animals subitize, or perceive and estimate the number of objects by glance.”
Lists
These user-created lists contain the word ‘subitize’.
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The "ize" have it
accessorize, finalize, computerize, prioritize, anodize, belizean, bizerte, capsize, citizen, denize, dizen, diazotize and 98 more...
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phrontistery-s
from phrontistery.info
sabaton, sabbatarian, sabbulonarium, sabelline, sabin, sable, sabliere, sabot, sabretache, sabulous, saburration, saccade and 1593 more...
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difficult words
ordure, tatterwallop, callipygian, odious, colophon, cynosure, hardener, emollience, valetudinarian, demonym, volage, polysemantic and 280 more...
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Just 'cause I like 'em, S
scrunch, solace, sabotage, saccade, sacerdotal, sacrilegious, sacristy, snappy, skew, steadfast, scowl, scorch and 781 more...
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Mispronounced but not misused
Words I use without really knowing how to say them aloud
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GRE list 1
Bloviate, Bacchanalia, mirth, covet, inconsequential, prescient, heresy, revelry, modality, gentrify, vitiate, tantalize and 182 more...
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Specific
philtrum, subitize, agelast, abderian, tyro, zenocratically, logorrhea, aceldama, micawber, foyer, hircine, losel and 95 more...
Tweets
Looking for tweets for subitize.

reesetee Take a subitizing test. May 11, 2011
Nayohaase To tell the number of items in a collection without counting them one by one. An ability of some idiot savants. Found the word in a book called "The number sense" Sep 20, 2009